interesting thread.
Combat Mission building model used the first method, you could place units at the back of the building to get them out of the way. Didnt work too well for smaller builings however, you the squad would manually adjust itself to fit in the building and present itself as a target without your influence, was annoying.
not got a copy of TOW yet, waiting on new pc (may get PS3 for GTA4 but thats another story) ... but looking forward to it. May wait on version 2 however is i cant order online without credit card
Cheers
Scott