I wish for gunners on WW1 planes and wirbelwinds and other gvs/planes to have to switch magazines when the ammo for this ran out. The ammo counter would be changed to show how many bullets in the current mag and how many mags left. This way 2 people could take out a wirbelwind for example when its stopped to reload. This would also add some realism to planes which didn't have long belts of ammo (7.62mm machine guns in bettys come to mind).

not that it's a bad wish but, you do know the crew on a wirbel could reload faster than what you're thinking...to the tune of about, 6-700 rounds per minute (about like a thompson machine gun). i think the ostwind had a rate of fire of 75-120 rounds per minute. and off the top of my head, i think the quad 50 mount on the m16 motor gun carriage had 100 round ammo boxes on each gun.
you would have to dig around to find specifically which light machine gun aircraft mounts didn't have high capacity magazines of 200-500 rounds.
and i'm curious as to when the japanese built 7.62mm light machine guns in world war 2...try 7.7 and 7.92 mm.