you can fly from the drone position also. get in the nose/chin gunner position and use what would be your rudder and it will bank your aircraft.
Yes I know this and use it all the time, however, I meat actually "flying" the aircraft not using an extended version of the autopilot.

Show me the proof please!
Yes an "attached" gunner can switch planes, but until you show me the proof I refuse to accept that you are correct.
GHOSTH!!! I'm going to have to call out the Ghost Busters on your butt for making me use up my photo bucket bandwidth.

Ok here we go, I'm flying some B17's to try and prove this point.
Here I am gunning from the nose gun on plane #1, notice the plane 1 in the upper left corner.

Here I am gunning from plane #2's nose gun.

Here I am gunning from plane #3's nose gun.

Finally here I am opening the bomb bay doors and banking the aircraft while in plane #3's nose gun. Secondly notice I'm flying offline so I'm not gunning for anyone.

I really don't know what else to do in order to prove this besides saying hop in the game and try it yourself.

Sir.