in addition to Collection each() and apply(), I wanted to make it easier to attach event listeners to node collections, so I went with David Johansson's approach for whitelisting on() and off().

The difference now is that the on() and off() methods are dynamically
added to the Collections prototype from Node, which acts as a wrapper
around each()

dist/kinetic-core.js

@@ -1507,6 +1507,7 @@ Kinetic.Node.prototype = {
                 addChildren(nodes);
             }
         }
+
         if(that.nodeType !== 'Stage') {
             addChildren(that.getStage().getChildren());
         }
@@ -2280,6 +2281,22 @@ Kinetic.Node.prototype.isListening = Kinetic.Node.prototype.getListening;
  */
 Kinetic.Node.prototype.isDraggable = Kinetic.Node.prototype.getDraggable;
 
+// collection mappings
+(function() {
+    var collectionMappings = ['on', 'off'];
+    for(var n = 0; n < collectionMappings.length; n++) {
+        // induce scope
+        (function(i) {
+            var method = collectionMappings[i];
+            Kinetic.Collection.prototype[method] = function() {
+                var args = [].slice.call(arguments);
+                args.unshift(method);
+                this.apply.apply(this, args);
+            };
+        })(n);
+    }
+})();
+
 /**
  * set node x position
  * @name setX
@@ -2413,7 +2430,6 @@ Kinetic.Node.prototype.isDraggable = Kinetic.Node.prototype.getDraggable;
  * @name getListening
  * @methodOf Kinetic.Node.prototype
  */
-
 ///////////////////////////////////////////////////////////////////////
 //  Container
 ///////////////////////////////////////////////////////////////////////

src/Node.js

@@ -284,6 +284,7 @@ Kinetic.Node.prototype = {
                 addChildren(nodes);
             }
         }
+
         if(that.nodeType !== 'Stage') {
             addChildren(that.getStage().getChildren());
         }
@@ -1057,6 +1058,22 @@ Kinetic.Node.prototype.isListening = Kinetic.Node.prototype.getListening;
  */
 Kinetic.Node.prototype.isDraggable = Kinetic.Node.prototype.getDraggable;
 
+// collection mappings
+(function() {
+    var collectionMappings = ['on', 'off'];
+    for(var n = 0; n < collectionMappings.length; n++) {
+        // induce scope
+        (function(i) {
+            var method = collectionMappings[i];
+            Kinetic.Collection.prototype[method] = function() {
+                var args = [].slice.call(arguments);
+                args.unshift(method);
+                this.apply.apply(this, args);
+            };
+        })(n);
+    }
+})();
+
 /**
  * set node x position
  * @name setX

tests/js/unitTests.js

@@ -742,7 +742,7 @@ Test.prototype.tests = {
 
         test(shapes.length === 2, 'shapes array should have 2 elements');
         var a = 0;
-        shapes.apply('on', 'mouseover', function() {
+        shapes.on('mouseover', function() {
             a++;
         });
         circle.simulate('mouseover');