Right now, it is impossible to perform any sort of building-related operations. A simple room clearing is out of the question. You can assign a building position in the waypoint editor, but that is pretty much it.
Arma is going in the way of the small-scale spec ops game, in which CQB/MOUT type operations are going to be quite common. AI behaviour in an urban terrain has always been a problem. It severely breaks immersion in single player gameplay.
- Building entry techniques (even if scripted) as a team
- Room clearing
- Exiting the building as a team
- Garrisoning houses as defensive position and shooting out of it
This should be implemented both in the editor and in the in-game order menu.