elevon on a flying wing: the aileron function is normal.. just add thhat the control surfaces both move up for up elevator or both mofe down for down elevator.

You can mix this same function in on an aircraft with tailplanes... and its useful for some 3D maneuvers. However its a good idea to have the mix on a 3-position programming switch. Sometimes you want the elevator and ailerons to go the same direction. Sometimes you want them to go opposing directions. Sometimes you want the ailerons to remain neutral (or just operate as ailerons) when the elevator moves.