Dave,
I will use the flaps when I adjust the payload weight by three pounds or so to simulate the 30 oz+ wing loading of a warbird, or I want to use the plane when STOL function would be helpful. (Like when you have a spot landing or shortest take off type of competition).
Flaperons while they do work to a degree, also increase the chance of a tip stall, due to the effect of increasing the AOA of the wingtip.

Paul