I have the GP Cap 231EX ARF (discountinued, aka Splat 231) and have tried the spoileron approach. All I can say is YIKES! With the "flaps" down it will slow the stall speed, but it's REALLY tipsy.

So, if you are doing this to aid in landing (I fly at a really short field), my advice is not to do it... I learned my lesson by breaking the gear plate out!

However, it does help in flatten a spin -- even better, move both ailerons up and try and inverted flat spin!

-Chris