RE: ultra stick 120 and 6XAS transmitter question
I don't know about your radio, but my 7CAP can't do the flaps to aileron mix. What I decided to do is build a wiring harness with those Multiplex 6 pin connectors. I'm going to solder up two intermediate adapters, one will Y the aileron channels to the flap servos, the other will run the flap channel to a reverse Y to control the flaps and the ailerons will run straight through. That way I can decide how I want to fly when I put the wing on at the field.
Chris