I say no to flapperons and yes to split flaps.

Split flaps can be added with minimum modification to the wing and will help avoiding tip stalls while slowing the plane.

Some experiments will be good before proceeding with servo and linkage installation.

http://en.wikipedia.org/wiki/Flap_(aircraft)

http://www.rcuniverse.com/forum/m_12...tm.htm#1269504