One thing that I really liked in games factory and mmf is when you copied some events from say another game, and the events had references to objects that didn't exist in the current game, it put a little placeholder that meant the object didn't exist. You could then right click on it and make it so any reference to the old object can now refer to an object that you specify.
It was really handy and you could do it with any object at any time.
I believe such a feature would be really beneficial in construct and i think it would also help with copying event sheets between games
that's all