Define DomEvent.stop() as a shortcut to stopPropagation() / preventDefault().

src/browser/DomEvent.js

@@ -79,7 +79,12 @@ var DomEvent = {
 		} else {
 			event.cancelBubble = true;
 		}
-	}
+	},
+
+	stop: function(event) {
+		DomEvent.stopPropagation(event);
+		DomEvent.preventDefault(event);
+	},
 };
 
 DomEvent.requestAnimationFrame = new function() {

src/ui/Event.js

@@ -29,8 +29,7 @@ var Event = this.Event = Base.extend({
 	},
 
 	stop: function() {
-		this.stopPropagation();
-		this.preventDefault();
+		DomEvent.stop(this.event);
 	},
 
 	// DOCS: Document Event#modifiers