RE: 2 rx for planes
giant scale guys do it alot just for redundency. I set up my 33% extra with dual rx's, switches and batteries. has 2 servos on each aileron and the rudder and one on each ele halve.
The way i set it up is one rx powers one servo in each aileron, rudder and ele . the other powers the other servo. put the throttle and choke on one rx, engine kill and smoke on the other. the hope being if i ever have a total failure on on side i can atleast keep it from turning into a lawn dart....or turn it into a lawn dart if its headed at somthing I really do not want it to hit.