here is an even better spot, MUCH better IMHO. put the spoilerons/flaperons on the left shoulder slider, giving you variable control. My hand is on that almost as much as any primary flight control. especially good for landing, kill the throttle up high, glide around for awhile, then use that to drop in at your feet, reflexing the ailerons up to drop like a rock or dropping them way down to float on in.

I've got mine set up that with so much mix that in the full up or down position the servo is at the end of its travel. aileron control only moves one surface! (yeah, not very controllable at that time, but they work great as speedbrakes in vertical dives!)