Well, logically, they could do it, but it has to do with picking. A pick by UID (as it currently is), sets the object type in the editor, so it knows exactly what actions to offer.
A global pick by UID can definately happen, but with out some type detection events (like, if object is PlayerSprite), then only common events would be allowed. And I don't even think Destroy is common, because that isn't available to Mouse, etc.
So you could pick, but without some type detection events, I don't think you could do anything with it. Now, if we get filtering type detection events, that could work...
But then you could have done the selective pick that it currently does. I just don't think that works with their editor paradigm.