Most notably, doors. I want to replace every door in the world with a sliding door, and it’s very hard to do that when I have 20+ non-sliding doors that I can’t get rid of in my swanky new Rapture time share. Make objects like any other objects, and let me yank them out of existence if I want to. I don’t want to have to build new rooms in my rooms just to find a use for the dozen door objects you guys have put all this effort into making.