I thought drooping the ailerons relative to the root would equate to wash-in and raising is wash-out, or am I mistaken?

If the flaps are large and the ailerons still droop down albeit less than the flaps, the effect still could be called washout because the angle of attack is still seen as less at the tip compared to the root. It just depends on how much of a parachute you want it to be. David's lift spoiling approach would make it less likely to hop back in the air once it has touched down and the chance of a tip stall is very low. The mega-lift approach may have a problem there with not settling down and the increased drag may cause a flame-out landing to stall out and fall short of the strip.

Either way, I think the majority is already pointing towards an answer of independent control surfaces... If you build them separate, you can play with the geometry and find what's best.

Kelly