The game should also have something to keep players from just WAITING ON THE TOP ROOM/DECK/ROOF/WHATEVER. I was thinking maybe something like every map has a power system, but not all the rooms can be powered at the same time, so some are left dark. Then every few minutes the rooms powered switched randomly, so some powered will turn off and vice versa. Thus this will make players move around rooms and stuff. Also you should be able to power down rooms yourself, of course there would be a cool down from the time a room powers back on again to when you can power down again.