I find that flaperons are actually cause take off and approach more dangerous than without them at higher speed. Conventional flaps only increase AOA in the centre of the wing. This causes a washout type effect, so if you still stall the airplane, it wont spin, the nose will just gently drop. With flaperons, you increase the AOA of the whole wing. Lets say you try to make a turn to the right with flaperons extended... You increase the AOA of left wing further, increasing drag on left considerably as the right wing goes almost clean. This causes horrible adverse yaw characteristics. To keep my planes with flaperons flying coordinated, I had to fly with rudder almost exclusively. Furthermore, if you try to roll hard with flaperons down, it is possible to stall the (supposed to be) upgoing wing, because the AOA is already high across the whole wing, and when you increase AOA on the left panel furhter. Now, you may exceed the critical AOA and stall left wing, causing a spin to left, when you tried to roll right...
I had flaperons on two of my 46 size airplanes (trainer and aerobatic). both planes had considerable size ailerons, and I found the flaperons favoured slow flight characteristics very little. I almost lost my aerobatic plane on a STOL t/o with flaperons extended, as I took off, and at low airspeed gave it lots of up elevator and right aileron. It came very close to snapping into the ground, but I saved It with rudder and removal of other control....
also, flaperons are a pain to set up.
moral of story, flaperons bad....