The damage system is really bad when it comes to infantry. A bullet can stop a tire of an offroad but wont kill someone even if shot to the head? I prefer Arma Cold War Assault damage system over this one, it's more realistic, I think this could be fixed if you take your time.
About aicraft, c'mon, only 2 (AA and CAS Buzzard)?
We could have transport planes, like the C-130, heavy bombers, like the B-1 lancer and even civilian planes like a private jet.
Besides, when it comes to armored vehicles, we could have anti-tank weaponry like the former German Stug, or even artillery updates with something like a Howitzer.