I have a Futaba 8U radio and have tried mixing the elevator servos by using channels 2 (elevator) and 6 (flap) (I have a 7 channel receiver and so using channel 8 is not an option). The mixing works OK but the dial for channel 6 is still active and Im afraid that I will bump it and cause a crash. Is there any way to disable the dial but still have the mixing turned "on". So far I havent been able to figure out how to do both.