When in bombers, and you switch to a particular gun position, I believe you are always in the center bomber. I think there is a way to switch to say a drone airplane in the same gun postion?
Also, someone told me and I forgot how, there is a key you can press which makes all guns visible on a target fire on the target.
For example, if you are in the tail gun position and a con is diving high and at a diagonal. The actual guns that could fire are rear, top and left waist gunner lets say. Is there a key you press so that all these guns will be firing at the target, as opposed to say, just the tail guns firing?