There already is a cardboard box. I'm pretty sure they have dances too. They just need to make them breakable.
That would lag the living daylights out of almost every single computer in history on a map with a lot of fences and such...
House would be too much. Porta potties? --- Post updated --- No not on the maps. Just as a selectable prop.
Oh...well, that would actually make quite a bit of sense, to be honest. It also would be cool to have in-game