Cub Man, I had forgot about the rudder pedals... the return spring sounds like a good idea... having separate micro servos is not always necessary, it adds a bit more weight, which isn't that big of an issue, and it requires power to drive them... I think utilizing the primary control servos and eliminate the potential for binding and put safeguards in place in case they do bind... some lightweight fishing lead from the rudder servo around a small pulley to each rudder pedal with a return spring would be a safe method... it all depends on the space required and the practicality of it.
John M,