It can stand for many things... Reaction Control System, Remote Controlled Sledgehammer, Really Clumsy Segway...

but mainly it's Bodacious Fyraan-Gaaris' bigger, angrier cousin... Radical Cholmondeley-Smythe :P

I'm using a Devo 7e, so will probably just have a play with the aileron curve to be flatter towards the middle then go exponential towards the limits, that way I can still go full horizontal thwacker when needed but have more control in the middle of the stick's travel. Done this on a few other machines as well to make that low-speed maneuvering easier to control.