How about a practical real world solution, as opposed to throwing around theories that apply to full scale (which don't always apply when scaled down). I always wick the balsa on my ailerons with ca to stiffen them (requires a little bit of extra sanding) and I always seal the hinge gap with clear packaging tape, I have never experienced flutter of any kind on my models.

I believe this to be a function of lazy people buying cheap pre-built airframes. just my 2 cents.

Build your own birds and this wont happen nearly as often.