As for flaperons I agree with SRT above but go one step further and suggest that flaperons are generally a bad idea on most airplanes no matter, monoplane, biplane, barn door ailerons or strip ailerons. By their very nature with the aileron mix they cannot extend far enough to rival a true decicated flap surface and what often happens with flaperons is while yes you can go a tiny bit slower with the flaperon down but most will tend to carry more power for control during approach and there is no real speed reduction during the approach. One generalization that could be made about flaperons (this does not include true dedicated flaps) is they increase the needed pilot skills dramatically and tend to cause more crashes.
I can personally attest to the accuracy of the above!
