Flaps & ailerons seperate is the way to go. Dropping the flaperons increases the local angle of attack at the wingtip. (=washin) This is bad! Tip stalling as you turn onto finals will be a piece of cake.
Conversly, flaps increase the local angle of attack at the root, the wingtip in comparison will be at a low angle of attack (=washout). This is good! Tip stalling is delayed, full flap is available, no adverse yaw problems, its a no-brainer really.
How many full size aircraft have flaperons?
Have fun,
John Mac.