Pilots didn't have C-47's fly in ammo and fuel for their fighters parked on a dirt strip they found while flying. If you want to have it so fuel and ord must be up to have both of those reloaded then OK, but I think mg and cannon ammo were stored seperatly from the bombs and rockets.
It isn't a way for anyone to "game" the hanger status. If you flew to your field, only to discover the hangers had been destroyed, you would land and say to the ground crew "gas and ammo", regardels of whether the hangers had been destroyed.
And another reason you might want to change the fuel load out for wrong way: Hangers are down, flying an La-7 with limited range, see the fight is getting higer requiring more climging, hey look at that, after a while 50% just ain't gona cut it.