I have the aeroworks 60/90 edge 540 with dual servos installed in the tail. I need a new radio, and would rather program the reverse on the servo than get one of those lil switch boxes with a y cord. what radios will have the correct mix option that i need? what is that mix called is it dual elevator? I have been away from r/c aircraft for 5 years and i cant remember anything. the hobby has changed so much. and my local hobby shop has no clue either. thank you. Matt