diff --git a/src/kiri/init.js b/src/kiri/init.js
index 350aeb18..b22b4d44 100644
--- a/src/kiri/init.js
+++ b/src/kiri/init.js
@@ -2239,7 +2239,7 @@
         // block standard browser context menu
         DOC.oncontextmenu = (event) => {
             let et = event.target;
-            if (et.tagName === 'CANVAS' || et.id === 'context-menu') {
+            if (et.tagName === 'CANVAS' || et.id === 'context-menu' || et.classList.contains('draggable')) {
                 event.preventDefault();
                 event.stopPropagation();
                 return false;
diff --git a/src/mode/cam/client.js b/src/mode/cam/client.js
index eb654ea0..766e741d 100644
--- a/src/mode/cam/client.js
+++ b/src/mode/cam/client.js
@@ -290,6 +290,9 @@
                     func.opDel(rec);
                 };
                 let el = $(id);
+                if (rec.disabled) {
+                    el.classList.add("disabled");
+                }
                 bounds.push(el);
                 let timer = null;
                 let inside = true;
@@ -331,6 +334,17 @@
                     if (!clist.contains("draggable")) {
                         return;
                     }
+                    if (ev.ctrlKey || ev.metaKey) {
+                        rec.disabled = !rec.disabled;
+                        ev.preventDefault();
+                        ev.stopPropagation();
+                        if (rec.disabled) {
+                            clist.add("disabled");
+                        } else {
+                            clist.remove("disabled");
+                        }
+                        return true;
+                    }
                     clist.add("drag");
                     ev.stopPropagation();
                     ev.preventDefault();
diff --git a/src/mode/cam/slice.js b/src/mode/cam/slice.js
index 79ef6939..e3b1d2ec 100644
--- a/src/mode/cam/slice.js
+++ b/src/mode/cam/slice.js
@@ -131,7 +131,7 @@
         let opSum = 0;
         let opTot = opList.map(op => op.weight()).reduce((a,v) => a + v);
 
-        for (let op of proc.ops) {
+        for (let op of proc.ops.filter(op => !op.disabled)) {
             let opfn = OPS[op.type];
             if (opfn) {
                 let opin = new opfn(state, op);
diff --git a/web/kiri/index.css b/web/kiri/index.css
index b5a3e23d..c6bde899 100644
--- a/web/kiri/index.css
+++ b/web/kiri/index.css
@@ -637,6 +637,9 @@ th, tr, td, label {
 #oplist .drag {
     background-color: var(--highlight) !important;
 }
+#oplist .disabled {
+    background-color: rgba(220,150,150,0.5) !important;
+}
 #oplist div .label {
     pointer-events: none;
 }