I'm not sure you'll actually need or use the dual aileron ervos in the Sportster. (It fly's very well with a single servo and slows enough on landing so flaperons aren't needed.)

But I'd say do it, just for the experience. Then you CAN program in flaperons once you get use to the planes characteristics. It'll get you acquainted with using flaps on landings, even if they're not needed.
Dennis-