Welcome to RCU ATL-Rick!!

Consider that it is not as easy as splitting the ailerons.

You could do so at about half of the aileron's length; however, you will need to compensate for the area that will be subtracted from the ailerons, or the roll capability will suffer.

Hence, you will need to replace each aileron for one with double chord.

The flaps will have chords similar to the ailerons and could be controlled by the central servo via the original torque rods.

By doing all that, the area and lift of the wing would be increased in around 12%.
Because of that and because flap deflection usually results in nose down or up pitch, the elevator surface may need to be increased as well.

This article explains much about flaps:

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