[Robotic Pope]

If you didn't want to use the joystick for the gunner, there could be an option to use a mouse directed turret. So you would move a small mouse curser to where you want the turret to move to and the actual gun would lag behind and fire at the correct speed for that aircraft. I understand the OP's point, It is rather unrealistic to have huge motorised turrets that you can move around like you're firing a pistol.