Flaperons are a combination of flaps AND ailerons. You have the flap feature, but they also work as ailerons, so they will go up and down even with the flaps engaged.

Unless you have full length strip type ailerons DON'T DO IT. With flaperons you have a substantially higher chance of tip stalling, even with full length strip ailerons.

If this is a new build, I suggest splitting the aileron and have separate ailerons and flaps.

Another thing is, what type of plane ? MOST planes, with the exception of warbirds (and not all of them) and high wing loading planes do not need flaps. If your wing loading is under 25 oz, you most likely do not need them. 25 0z - 30 oz can go either way. Over 30 oz put flaps on.