Ah, didn't see that part. So they needed three buttons to fire two weapons.. (*shakes head*) Brits..
As for the ammo counter, I'm beginning to think that it's a universal thing. Instead of removing the ammo counters totally, I think they're making a compromise and putting it at places where you can't look it up at a glance, and would need to consciously change the view/angle to see it - which would make it a bit more difficult in combat.
So far, none of the newly modelled plane has an ammo counter visible in the default view. (Well, you can sort of see it on the P-47, but...)