to be able to engage from helo's safely you need fix'd seating positions. for a blackhawk you can fit 3 to 4 on the door, thats 6 to 8 positions to shoot from and a few more non shooting positions. it would be crazy to just let everyone run around inside the bird and would result in guys hitting each other and bumping others out the doors. for the MH6 you can allready look around just change it so you can shoot too. i think with the chinook, CH53'S and other helos with ramps and small doors they should just leave the shooting up to the gunners. most chooks these day's have two guns[ 1 each side] and a tail mount, better then nothing.
you can supress targets quite well in real life from the air so why shouldnt you be able to do it in AA2. also they sould just limit it to small arms and grenades, rockets will hurt too many people in the bird.
in real life you can also snipe quite accuratly with the help of straps and fixed mounts, shooting a long rifle in the shoulder though while sitting down with no support is not. i hope they think about this when deciding what to do on this subject.