It seems simple, but the spawn system would have to be completely redone to do it. Currently there are two ways to spawn; click H and you pop up at a certain location in the hanger. Click anywhere else and you're spawned within a certain radius from the actual spawn point placed by the map maker.
You could make spawns into each hanger, but then you'd lose the ability to spawn in three directions from the field as each hanger would take up a spawn button on the clip board. You could also do a random spawn within a radius on the pad, but you'd end up with tanks constantly on top of or colliding with the hanger objects.
