There's a French Biplane called an Aviasud Mistral with an all moving lower wing. Drops a wing horribly at the stall because it's hard to ensure that they are properly parallel, and the roll feel is funny - the UK put anti-balance tabs on the inboard trailing edge which helped a bit.
But, I'm not sure it'll ever replace the Aileron. Nor, frankly do I see the need - snappy roll response is in large part produced by low to neutral lateral stability combined with low roll damping, then adequate aileron power.
G
