I normally go for this in some games. but what is frustrating is that if you cant shoot out then you have to touch the ground when jumping off a ramp, usually with no cover only to have a MG tear you to shreds because they are locking down that last flag.
But then if you can shoot out but not in you can never get that last flag because team is camping in spawn locking it down. So i agree that as long as you can see them, and they are fighting from within the spawn, then the area they are utilizing is fair game.