diff --git a/ui_server.py b/ui_server.py
index 90129ac..f0b5c85 100644
--- a/ui_server.py
+++ b/ui_server.py
@@ -1602,7 +1602,7 @@ HTML = """<!doctype html>
           <button id="configResetLayout" type="button">сбросить раскладку</button>
           <button id="configRestoreToggle" type="button" aria-expanded="false">структура</button>
           <label class="config-scale-control" title="Масштаб элементов и текста выбранного блока: 50–200%"><span id="configScaleLabel">масштаб блока</span><input id="configContentScale" type="range" min="50" max="200" step="5" value="100" aria-label="Масштаб содержимого выбранного блока, от 50 до 200 процентов" disabled><output id="configContentScaleValue">100%</output></label>
-          <span id="configLayoutState" class="config-layout-state">перетаскивайте за заголовок или свободное место</span>
+          <span id="configLayoutState" class="config-layout-state">Ctrl/Cmd + клик — выбрать несколько · перетаскивайте группу</span>
         </div>
         <div id="configWorkspace" class="config-workspace">
           <div id="configRestorePanel" class="config-restore-panel" hidden>
@@ -1621,7 +1621,7 @@ HTML = """<!doctype html>
               </label>
               <button id="configCreateBlock" type="button">создать блок</button>
             </div>
-            <span class="config-structure-hint">Клик по строке фокусирует блок. Перетаскивайте на canvas, меняйте размер границей, удаляйте через корзину.</span>
+            <span class="config-structure-hint">Клик фокусирует блок. Ctrl/Cmd + клик выбирает несколько. Перетаскивайте группу на canvas или в корзину.</span>
             <div id="configRestoreList" class="config-restore-list"></div>
             <button id="configDeletedToggle" class="config-deleted-toggle" type="button" hidden>корзина</button>
             <div id="configDeletedList" class="config-deleted-list" hidden></div>
@@ -1827,7 +1827,7 @@ HTML = """<!doctype html>
           <button id="networkResetLayout" type="button">сбросить раскладку</button>
           <button id="networkStructureToggle" type="button" aria-expanded="false">структура</button>
           <label class="config-scale-control" title="Масштаб элементов и текста выбранного сетевого блока"><span>масштаб блока</span><input id="networkContentScale" type="range" min="50" max="200" step="5" value="100" aria-label="Масштаб содержимого выбранного сетевого блока" disabled><output id="networkContentScaleValue">100%</output></label>
-          <span id="networkLayoutState" class="config-layout-state">перетаскивайте блоки за свободное место</span>
+          <span id="networkLayoutState" class="config-layout-state">Ctrl/Cmd + клик — выбрать несколько · перетаскивайте группу</span>
         </div>
         <div id="networkWorkspace" class="network-workspace">
           <aside id="networkRestorePanel" class="config-restore-panel network-restore-panel" hidden>
@@ -2092,6 +2092,7 @@ HTML = """<!doctype html>
     let configContentScale = 1;
     let configBlockObserver = null;
     let selectedConfigBlock = null;
+    let selectedConfigBlocks = new Set();
     function readConfigLayout() {
       try {
         const saved = JSON.parse(localStorage.getItem('fpv-config-layout-v1') || '{}');
@@ -2135,23 +2136,34 @@ HTML = """<!doctype html>
       saveConfigLayout();
     }
     function selectConfigBlock(block) {
-      if (!block || configBlockState(block)) {
-        selectedConfigBlock = null;
-        configBlocks.forEach(other => other.classList.remove('is-selected'));
-        const control = $('configContentScale');
+      selectedConfigBlocks = new Set(block && !configBlockState(block) ? [block] : []);
+      updateConfigSelection(block);
+    }
+    function updateConfigSelection(preferred = selectedConfigBlock) {
+      selectedConfigBlocks = new Set([...selectedConfigBlocks].filter(block => configBlocks.includes(block) && !configBlockState(block)));
+      selectedConfigBlock = selectedConfigBlocks.has(preferred) ? preferred : [...selectedConfigBlocks].at(-1) || null;
+      configBlocks.forEach(other => other.classList.toggle('is-selected', selectedConfigBlocks.has(other)));
+      $('configRestorePanel')?.querySelectorAll('.config-restore-item').forEach(item => item.classList.toggle('is-selected', selectedConfigBlocks.has(item._configBlock)));
+      const control = $('configContentScale');
+      if (!selectedConfigBlock) {
         if (control) control.disabled = true;
         return;
       }
-      selectedConfigBlock = block;
-      configBlocks.forEach(other => other.classList.toggle('is-selected', other === block));
-      const entry = configLayout[block.dataset.section] || {};
+      const entry = configLayout[selectedConfigBlock.dataset.section] || {};
       const value = Math.round((Number(entry.scale) || 100));
       configContentScale = Math.max(.5, Math.min(2, value / 100));
       setValue('configContentScale', value);
       setText('configContentScaleValue', `${value}%`);
-      const control = $('configContentScale');
-      if (control) control.disabled = false;
-      updateConfigBlockScale(block);
+      if (control) control.disabled = selectedConfigBlocks.size !== 1;
+      updateConfigBlockScale(selectedConfigBlock);
+      if (selectedConfigBlocks.size > 1) setText('configLayoutState', `выбрано ${selectedConfigBlocks.size} блока · перетаскивайте группу`);
+    }
+    function toggleConfigBlockSelection(block, additive = false) {
+      if (!block || configBlockState(block)) return;
+      if (!additive) return selectConfigBlock(block);
+      if (selectedConfigBlocks.has(block)) selectedConfigBlocks.delete(block);
+      else selectedConfigBlocks.add(block);
+      updateConfigSelection(block);
     }
     function configTitle(block) {
       return block.querySelector(':scope > summary .block-title')?.textContent || block.dataset.section || 'Блок';
@@ -2283,29 +2295,39 @@ HTML = """<!doctype html>
       if (fitted) saveConfigLayout();
       updateConfigCanvasHeight();
     }
-    function setConfigBlockState(block, state) {
-      if (!block) return;
-      if (state && block.contains(document.activeElement)) document.activeElement.blur();
-      const key = block.dataset.section;
-      if (key && state) configLayout[key] = {...(configLayout[key] || {}), state};
-      else if (key && configLayout[key]) {
-        delete configLayout[key].state;
-        if (!Object.keys(configLayout[key]).length) delete configLayout[key];
-      }
-      block.dataset.blockState = state || '';
-      block.classList.toggle('config-block-hidden', state === 'hidden');
-      block.classList.toggle('config-block-deleted', state === 'deleted');
-      if (state) block.setAttribute('aria-hidden', 'true');
-      else block.removeAttribute('aria-hidden');
+    function setConfigBlockStates(blocks, state) {
+      const items = [...new Set(blocks)].filter(block => block && configBlocks.includes(block));
+      if (!items.length) return;
+      items.forEach(block => {
+        if (state && block.contains(document.activeElement)) document.activeElement.blur();
+        const key = block.dataset.section;
+        if (key && state) configLayout[key] = {...(configLayout[key] || {}), state};
+        else if (key && configLayout[key]) {
+          delete configLayout[key].state;
+          if (!Object.keys(configLayout[key]).length) delete configLayout[key];
+        }
+        block.dataset.blockState = state || '';
+        block.classList.toggle('config-block-hidden', state === 'hidden');
+        block.classList.toggle('config-block-deleted', state === 'deleted');
+        if (state) block.setAttribute('aria-hidden', 'true');
+        else block.removeAttribute('aria-hidden');
+      });
       saveConfigLayout();
       applyStoredConfigLayout();
       renderConfigRestorePanel();
       selectConfigBlock(configBlocks.find(candidate => !configBlockState(candidate)) || null);
     }
-    function focusConfigBlock(block, item) {
+    function setConfigBlockState(block, state) { setConfigBlockStates([block], state); }
+    function focusConfigBlock(block, item, event) {
       if (!block || configBlockState(block)) return;
+      if (event?.ctrlKey || event?.metaKey) {
+        toggleConfigBlockSelection(block, true);
+        item?.classList.toggle('is-selected', selectedConfigBlocks.has(block));
+        bringConfigBlockFront(block);
+        return;
+      }
       configBlocks.forEach(other => other.classList.remove('is-selected'));
-      document.querySelectorAll('.config-restore-item.is-selected').forEach(node => node.classList.remove('is-selected'));
+      $('configRestorePanel')?.querySelectorAll('.config-restore-item.is-selected').forEach(node => node.classList.remove('is-selected'));
       selectConfigBlock(block);
       item?.classList.add('is-selected');
       bringConfigBlockFront(block);
@@ -2314,7 +2336,8 @@ HTML = """<!doctype html>
     function renderConfigItem(list, block, deleted = false) {
       const state = configBlockState(block);
       const item = document.createElement('div');
-      item.className = `config-restore-item${state ? ' is-hidden' : ''}`;
+      item.className = `config-restore-item${state ? ' is-hidden' : ''}${selectedConfigBlocks.has(block) ? ' is-selected' : ''}`;
+      item._configBlock = block;
       item.title = 'Нажмите, чтобы показать блок на canvas';
       const label = document.createElement('span');
       label.className = 'config-item-title';
@@ -2353,7 +2376,7 @@ HTML = """<!doctype html>
         actions.appendChild(remove);
       }
       item.append(label, stateNode, actions);
-      item.addEventListener('click', () => focusConfigBlock(block, item));
+      item.addEventListener('click', event => focusConfigBlock(block, item, event));
       list.appendChild(item);
     }
     function renderConfigRestorePanel() {
@@ -2384,7 +2407,8 @@ HTML = """<!doctype html>
       panel.hidden = !restorePanelOpen;
       workspace?.classList.toggle('has-structure', restorePanelOpen);
       const visible = configBlocks.length - hidden.length - deleted.length;
-      setText('configLayoutState', `${visible} блоков · ${hidden.length} скрыто · ${deleted.length} в корзине`);
+      const selected = selectedConfigBlocks.size > 1 ? ` · выбрано ${selectedConfigBlocks.size}` : '';
+      setText('configLayoutState', `${visible} блоков · ${hidden.length} скрыто · ${deleted.length} в корзине${selected}`);
       if (configCanvas) applyStoredConfigLayout();
     }
     function removeConfigBlockForever(block) {
@@ -2484,7 +2508,7 @@ HTML = """<!doctype html>
       trash.hidden = false;
       trash.classList.remove('is-over');
     }
-    function finishConfigDrag(block, event, dragged) {
+    function finishConfigDrag(block, event, dragged, group = [block]) {
       const trash = $('configTrash');
       const droppedOnTrash = trashDrop(event);
       if (trash) {
@@ -2492,14 +2516,16 @@ HTML = """<!doctype html>
         trash.hidden = true;
       }
       if (!dragged) return;
-      captureConfigLayout(block);
-      if (droppedOnTrash) setConfigBlockState(block, 'deleted');
+      group.forEach(item => captureConfigLayout(item));
+      if (droppedOnTrash) setConfigBlockStates(group, 'deleted');
       else {
         saveConfigLayout();
         setText('configLayoutState', `${configBlocks.length - configBlocks.filter(item => configBlockState(item)).length} блоков · раскладка сохранена`);
       }
-      block._suppressSummaryClick = true;
-      window.setTimeout(() => { block._suppressSummaryClick = false; }, 0);
+      group.forEach(item => {
+        item._suppressSummaryClick = true;
+        window.setTimeout(() => { item._suppressSummaryClick = false; }, 0);
+      });
     }
     function makeConfigBlockInteractive(block) {
       const summary = block.firstElementChild;
@@ -2522,9 +2548,16 @@ HTML = """<!doctype html>
         block.open = true;
       });
       block.addEventListener('pointerdown', event => {
-        selectConfigBlock(block);
-        bringConfigBlockFront(block);
+        const additive = event.ctrlKey || event.metaKey;
         const edge = configResizeEdge(event, block);
+        if (additive && !edge && !configDragBlocked(block, event)) {
+          event.preventDefault();
+          event.stopPropagation();
+          toggleConfigBlockSelection(block, true);
+          return;
+        }
+        if (edge || !selectedConfigBlocks.has(block)) selectConfigBlock(block);
+        bringConfigBlockFront(block);
         if (!edge || configDragBlocked(block, event)) return;
         event.preventDefault();
         event.stopPropagation();
@@ -2603,8 +2636,10 @@ HTML = """<!doctype html>
       if (event.button !== 0 || !configCanvas || configDragBlocked(block, event)) return;
       const startX = event.clientX;
       const startY = event.clientY;
-      const startLeft = parseFloat(block.style.left) || block.offsetLeft || 0;
-      const startTop = parseFloat(block.style.top) || block.offsetTop || 0;
+      const group = selectedConfigBlocks.has(block)
+        ? [...selectedConfigBlocks].filter(item => !configBlockState(item))
+        : [block];
+      const origins = group.map(item => ({item, left: parseFloat(item.style.left) || item.offsetLeft || 0, top: parseFloat(item.style.top) || item.offsetTop || 0}));
       let dragged = false;
       showConfigTrash();
       block.setPointerCapture?.(event.pointerId);
@@ -2613,12 +2648,18 @@ HTML = """<!doctype html>
         if (!dragged) {
           dragged = true;
           event.preventDefault();
-          block.classList.add('is-dragging');
+          group.forEach(item => item.classList.add('is-dragging'));
         }
         event.preventDefault();
-        const maxLeft = Math.max(0, configCanvasWidth() - block.offsetWidth);
-        block.style.left = `${Math.max(0, Math.min(maxLeft, Math.round(startLeft + moveEvent.clientX - startX)))}px`;
-        block.style.top = `${Math.max(0, Math.round(startTop + moveEvent.clientY - startY))}px`;
+        const rawDx = moveEvent.clientX - startX;
+        const minDx = -Math.min(...origins.map(origin => origin.left));
+        const maxDx = Math.min(...origins.map(origin => configCanvasWidth() - origin.item.offsetWidth - origin.left));
+        const dx = Math.max(minDx, Math.min(maxDx, rawDx));
+        const dy = moveEvent.clientY - startY;
+        origins.forEach(origin => {
+          origin.item.style.left = `${Math.max(0, Math.round(origin.left + dx))}px`;
+          origin.item.style.top = `${Math.max(0, Math.round(origin.top + dy))}px`;
+        });
         setTrashHover(moveEvent);
         updateConfigCanvasHeight();
       };
@@ -2627,8 +2668,8 @@ HTML = """<!doctype html>
         block.removeEventListener('pointermove', move);
         block.removeEventListener('pointerup', end);
         block.removeEventListener('pointercancel', end);
-        block.classList.remove('is-dragging');
-        finishConfigDrag(block, endEvent, dragged);
+        group.forEach(item => item.classList.remove('is-dragging'));
+        finishConfigDrag(block, endEvent, dragged, group);
       };
       block.addEventListener('pointermove', move);
       block.addEventListener('pointerup', end, {once: true});
@@ -2734,6 +2775,7 @@ HTML = """<!doctype html>
     let networkLayout = {};
     let networkZIndex = 1;
     let networkSelectedBlock = null;
+    let selectedNetworkBlocks = new Set();
     let networkStructureOpen = false;
     let networkContentScale = 1;
     function readNetworkLayout() {
@@ -2769,22 +2811,33 @@ HTML = """<!doctype html>
       block.style.setProperty('--block-scale', Math.max(.5, Math.min(2, Math.sqrt(area) * block._networkUserScale)).toFixed(3));
     }
     function selectNetworkBlock(block) {
-      if (!block || networkState(block)) {
-        networkSelectedBlock = null;
-        networkBlocks.forEach(item => item.classList.remove('is-selected'));
-        const control = $('networkContentScale');
+      selectedNetworkBlocks = new Set(block && !networkState(block) ? [block] : []);
+      updateNetworkSelection(block);
+    }
+    function updateNetworkSelection(preferred = networkSelectedBlock) {
+      selectedNetworkBlocks = new Set([...selectedNetworkBlocks].filter(block => networkBlocks.includes(block) && !networkState(block)));
+      networkSelectedBlock = selectedNetworkBlocks.has(preferred) ? preferred : [...selectedNetworkBlocks].at(-1) || null;
+      networkBlocks.forEach(item => item.classList.toggle('is-selected', selectedNetworkBlocks.has(item)));
+      $('networkRestorePanel')?.querySelectorAll('.config-restore-item').forEach(item => item.classList.toggle('is-selected', selectedNetworkBlocks.has(item._networkBlock)));
+      const control = $('networkContentScale');
+      if (!networkSelectedBlock) {
         if (control) control.disabled = true;
         return;
       }
-      networkSelectedBlock = block;
-      networkBlocks.forEach(item => item.classList.toggle('is-selected', item === block));
-      const value = Math.max(50, Math.min(200, Math.round(Number(networkLayout[block.dataset.section]?.scale) || 100)));
+      const value = Math.max(50, Math.min(200, Math.round(Number(networkLayout[networkSelectedBlock.dataset.section]?.scale) || 100)));
       networkContentScale = value / 100;
       setValue('networkContentScale', value);
       setText('networkContentScaleValue', `${value}%`);
-      const control = $('networkContentScale');
-      if (control) control.disabled = false;
-      updateNetworkBlockScale(block);
+      if (control) control.disabled = selectedNetworkBlocks.size !== 1;
+      updateNetworkBlockScale(networkSelectedBlock);
+      if (selectedNetworkBlocks.size > 1) setText('networkLayoutState', `выбрано ${selectedNetworkBlocks.size} блока · перетаскивайте группу`);
+    }
+    function toggleNetworkBlockSelection(block, additive = false) {
+      if (!block || networkState(block)) return;
+      if (!additive) return selectNetworkBlock(block);
+      if (selectedNetworkBlocks.has(block)) selectedNetworkBlocks.delete(block);
+      else selectedNetworkBlocks.add(block);
+      updateNetworkSelection(block);
     }
     function applyNetworkContentScale(value) {
       networkContentScale = Math.max(.5, Math.min(2, (Number(value) || 100) / 100));
@@ -2874,7 +2927,8 @@ HTML = """<!doctype html>
       networkBlocks.forEach(block => {
         const state = networkState(block);
         const item = document.createElement('div');
-        item.className = `config-restore-item${state ? ' is-hidden' : ''}`;
+        item.className = `config-restore-item${state ? ' is-hidden' : ''}${selectedNetworkBlocks.has(block) ? ' is-selected' : ''}`;
+        item._networkBlock = block;
         item.title = 'Нажмите, чтобы выбрать блок';
         const label = document.createElement('span');
         label.className = 'config-item-title';
@@ -2912,9 +2966,10 @@ HTML = """<!doctype html>
           actions.appendChild(remove);
         }
         item.append(label, stateNode, actions);
-        item.addEventListener('click', () => {
-          if (!state) selectNetworkBlock(block);
-          item.classList.add('is-selected');
+        item.addEventListener('click', event => {
+          if (state) return;
+          if (event.ctrlKey || event.metaKey) toggleNetworkBlockSelection(block, true);
+          else selectNetworkBlock(block);
           bringNetworkBlockFront(block);
         });
         list.appendChild(item);
@@ -2925,26 +2980,31 @@ HTML = """<!doctype html>
       toggle.setAttribute('aria-expanded', String(networkStructureOpen));
       panel.hidden = !networkStructureOpen;
       workspace?.classList.toggle('has-structure', networkStructureOpen);
-      setText('networkLayoutState', `${networkBlocks.length - hidden - deleted} блоков · ${hidden} скрыто · ${deleted} в корзине`);
-    }
-    function setNetworkBlockState(block, state) {
-      if (!block) return;
-      const key = block.dataset.section;
-      if (key && state) networkLayout[key] = {...(networkLayout[key] || {}), state};
-      else if (key && networkLayout[key]) {
-        delete networkLayout[key].state;
-        if (!Object.keys(networkLayout[key]).length) delete networkLayout[key];
-      }
-      block.dataset.blockState = state || '';
-      block.classList.toggle('is-hidden', state === 'hidden');
-      block.classList.toggle('is-deleted', state === 'deleted');
-      if (state) block.setAttribute('aria-hidden', 'true');
-      else block.removeAttribute('aria-hidden');
+      const selected = selectedNetworkBlocks.size > 1 ? ` · выбрано ${selectedNetworkBlocks.size}` : '';
+      setText('networkLayoutState', `${networkBlocks.length - hidden - deleted} блоков · ${hidden} скрыто · ${deleted} в корзине${selected}`);
+    }
+    function setNetworkBlockStates(blocks, state) {
+      const items = [...new Set(blocks)].filter(block => block && networkBlocks.includes(block));
+      if (!items.length) return;
+      items.forEach(block => {
+        const key = block.dataset.section;
+        if (key && state) networkLayout[key] = {...(networkLayout[key] || {}), state};
+        else if (key && networkLayout[key]) {
+          delete networkLayout[key].state;
+          if (!Object.keys(networkLayout[key]).length) delete networkLayout[key];
+        }
+        block.dataset.blockState = state || '';
+        block.classList.toggle('is-hidden', state === 'hidden');
+        block.classList.toggle('is-deleted', state === 'deleted');
+        if (state) block.setAttribute('aria-hidden', 'true');
+        else block.removeAttribute('aria-hidden');
+      });
       saveNetworkLayout();
       applyNetworkLayout();
       renderNetworkStructure();
       selectNetworkBlock(networkBlocks.find(candidate => !networkState(candidate)) || null);
     }
+    function setNetworkBlockState(block, state) { setNetworkBlockStates([block], state); }
     function createNetworkBlock(templateKey, title, existingKey = '') {
       const template = networkBlocks.find(block => block.dataset.custom !== 'true' && block.dataset.section === templateKey);
       if (!template || !networkCanvas) return null;
@@ -3018,33 +3078,43 @@ HTML = """<!doctype html>
       const trash = $('networkTrash');
       if (trash) { trash.hidden = false; trash.classList.remove('is-over'); }
     }
-    function finishNetworkDrag(block, event, dragged) {
+    function finishNetworkDrag(block, event, dragged, group = [block]) {
       const trash = $('networkTrash');
       const droppedOnTrash = networkTrashDrop(event);
       if (trash) { trash.classList.remove('is-over'); trash.hidden = true; }
       if (!dragged) return;
-      captureNetworkLayout(block);
-      if (droppedOnTrash) setNetworkBlockState(block, 'deleted');
+      group.forEach(item => captureNetworkLayout(item));
+      if (droppedOnTrash) setNetworkBlockStates(group, 'deleted');
       else { saveNetworkLayout(); renderNetworkStructure(); }
-      block._networkSuppressClick = true;
-      window.setTimeout(() => { block._networkSuppressClick = false; }, 0);
+      group.forEach(item => {
+        item._networkSuppressClick = true;
+        window.setTimeout(() => { item._networkSuppressClick = false; }, 0);
+      });
     }
     function startNetworkDrag(block, event) {
       if (event.button !== 0 || !networkCanvas || networkDragBlocked(block, event)) return;
       const startX = event.clientX;
       const startY = event.clientY;
-      const startLeft = parseFloat(block.style.left) || block.offsetLeft || 0;
-      const startTop = parseFloat(block.style.top) || block.offsetTop || 0;
+      const group = selectedNetworkBlocks.has(block)
+        ? [...selectedNetworkBlocks].filter(item => !networkState(item))
+        : [block];
+      const origins = group.map(item => ({item, left: parseFloat(item.style.left) || item.offsetLeft || 0, top: parseFloat(item.style.top) || item.offsetTop || 0}));
       let dragged = false;
       showNetworkTrash();
       block.setPointerCapture?.(event.pointerId);
       const move = moveEvent => {
         if (!dragged && Math.hypot(moveEvent.clientX - startX, moveEvent.clientY - startY) < 4) return;
-        if (!dragged) { dragged = true; moveEvent.preventDefault(); block.classList.add('is-dragging'); }
+        if (!dragged) { dragged = true; moveEvent.preventDefault(); group.forEach(item => item.classList.add('is-dragging')); }
         moveEvent.preventDefault();
-        const maxLeft = Math.max(0, networkCanvasWidth() - block.offsetWidth);
-        block.style.left = `${Math.max(0, Math.min(maxLeft, Math.round(startLeft + moveEvent.clientX - startX)))}px`;
-        block.style.top = `${Math.max(0, Math.round(startTop + moveEvent.clientY - startY))}px`;
+        const rawDx = moveEvent.clientX - startX;
+        const minDx = -Math.min(...origins.map(origin => origin.left));
+        const maxDx = Math.min(...origins.map(origin => networkCanvasWidth() - origin.item.offsetWidth - origin.left));
+        const dx = Math.max(minDx, Math.min(maxDx, rawDx));
+        const dy = moveEvent.clientY - startY;
+        origins.forEach(origin => {
+          origin.item.style.left = `${Math.max(0, Math.round(origin.left + dx))}px`;
+          origin.item.style.top = `${Math.max(0, Math.round(origin.top + dy))}px`;
+        });
         const trash = $('networkTrash');
         if (trash) trash.classList.toggle('is-over', networkTrashDrop(moveEvent));
         updateNetworkCanvasHeight();
@@ -3054,8 +3124,8 @@ HTML = """<!doctype html>
         block.removeEventListener('pointermove', move);
         block.removeEventListener('pointerup', end);
         block.removeEventListener('pointercancel', end);
-        block.classList.remove('is-dragging');
-        finishNetworkDrag(block, endEvent, dragged);
+        group.forEach(item => item.classList.remove('is-dragging'));
+        finishNetworkDrag(block, endEvent, dragged, group);
       };
       block.addEventListener('pointermove', move);
       block.addEventListener('pointerup', end, {once: true});
@@ -3065,9 +3135,16 @@ HTML = """<!doctype html>
       if (!block || block._networkInteractive) return;
       block._networkInteractive = true;
       block.addEventListener('pointerdown', event => {
-        selectNetworkBlock(block);
-        bringNetworkBlockFront(block);
+        const additive = event.ctrlKey || event.metaKey;
         const edge = networkResizeEdge(event, block);
+        if (additive && !edge && !networkDragBlocked(block, event)) {
+          event.preventDefault();
+          event.stopPropagation();
+          toggleNetworkBlockSelection(block, true);
+          return;
+        }
+        if (edge || !selectedNetworkBlocks.has(block)) selectNetworkBlock(block);
+        bringNetworkBlockFront(block);
         if (!edge || networkDragBlocked(block, event)) return;
         event.preventDefault();
         event.stopPropagation();
