I agree with Campy on that one. I'm also not much of a fan of flaperons. As soon as you use them you are altering the wing shape to increase lift. Then when you go to use aileron control you not only remove the additional lift from one wing, you increase it on the other wing. The differential drag he mentions is also real.

However - here's another thing to consider, it comes from full sized flying and is easier said than done to try it on RC planes. Use the rudder instead of aileron to control wing drop from such things as crosswinds. This applies especially if you are using flaperons (which are not often encountered on full sized planes). Try it up high and see!! In simplistic terms - you want to speed up the low wing to increase its lift. So if the port wing drops, apply starboard rudder to lift it. At the same time you will be turning into the wind and will introduce some side slip to get you on line for your landing - Please note - I did say it is easier said than done to train oneself to do this and often you will need to use a combination of aileron and rudder with rudder being the major input.

(For those of you that are wondering - yes I have flown a lot of vintage full sized planes but they weren't quite as vintage in those days)