RE: Fun with Flat Foam
Faperon is a combination of flaps and ailerons. If you have two aileron servos, you can use your ailerons as flaps too....but I don't suggest if you have ailerons all the way out to the wing tips.. that's just asking for a tip stall.
Flap trim just lets you dial in how much flaps you are using.
Airbrake also requires dual aileron servos. It raises both ailerons and the elevator. It effectivly lowers the wing incidence and reduces effectiveness of all of your control surfaces, especially the ailerons, but it makes the model fly at a nose up attitude creating a lot of drag and thus slowing it down. Again, I don't really suggest it..
If you really want to mess around with that kind of stuff, make yourself a plane with flaps about 1/3 the span near the root and ailerons the rest of the 2/3 of span. Then use the flap trim to slowly dial in flaps to get an idea of how they affect the plane.