It's now possible to trigger default events like .click(), .submit(), .focus(), etc. Using the jQuery event trigger.

src/event/event.js

@@ -82,12 +82,16 @@ jQuery.event = {
 
 		// Handle triggering a single element
 		} else if ( element["on" + type] ) {
+			if ( element[ type ] && element[ type ].constructor == Function )
+				element[ type ]();
+			else {
 				// Pass along a fake event
 				data.unshift( this.fix({ type: type, target: element }) );
 	
 				// Trigger the event
 				element["on" + type].apply( element, data );
 			}
+		}
 	},
 
 	handle: function(event) {