Camber control is a really effective way of changing the flying characteristics of an airplane. It is done all the time with pure gliders and motor gliders. For wings with semi symmetrical or flat bottom airfoils, some up reflex of the ailerons improves penetration at the expense of lift, absolutely essential if you are in sinking air and you want to get away from it. Whereas a few degrees of down flap enhances lift while in rising air aka thermals. On windy days a semi or flat airfoil will baloon annoyingly going up wind, some reflex reduces the balooning and enhances penetration at a constant altitude. Some glider guiders will continuously vary the camber during thermalling, reflexing upwind and down flap down wind, with a constant elevator setting and rudder offset to maintain circling. Neat huh? Trust me it takes some practice but it adds to the fun for some people.

ciao -rjf