I thought you would just use a switch to activate the flaperons.

With flaperons I thought the idea was that you can just pretend that you have two sets of control surfaces and just activate flaps as you normally would ie with one of the switches.

Actually I'm not to sure whether most people who use flaps have variable or just hard on/off flaps. If I was going to have flaps I'd probably opt for the hard on/off approach. It seems much simpler and requires less concentration.

I'm not really sure how transmitters work. Actually this is probably a good oppurtunity to ask them.

Say you have a 6ch radio. You have 2 auxilery channels which can be assigned to either a knob or a switch (or more maybe). Is it possible on most transmitters to replace a switch with a knob and visa versa so as to customise your handset? Also, is it possible on most transmitters that have mixing options to choose which auxilery channel you mix into your flapperon setup?