Many STOL type aircraft have the ailerons function as flaperons. I've noticed that most of them mix in much less travel than the inboard flaps, i.e. when the flaps are fully extended to approx 40 degrees, the ailerons might be half that or less. Several fighter types use flaperon too (eg. F-18), but when the flaps are fully down, the horozontal stabilators (pivoting one piece control surface) provide roll control. If you have seperate servos for the ailerons, and a computer radio capable of mixing the ailerons to flaps, go for it - it's fun to experiment.