Ben,
If you are in knife edge flight.......I would presume that kicking top or bottom rudder would more replicate the elevators, than the ailerons?
At that same point of flight(knife edge) would not the elevators then act as the rudder.....pulling would give you a left turn....pushing a right turn?
I can't figure out what you would use for ailerons in knife edge flght.......cept for me in my open cockpit biplane. Seems to me if I stuck out my tongue at just the right time...some sort of a bank angle might result. Grin.
Course, my son will tell me that I am wrong...but I had to jump in here before he did. Grin.
Regards,
Mel