Flaperons allow ailerons to move the same direction in unison as flaps or spoilers and independantly as ailerons. Elevons are used for delta wings where ailerons and elevator must be combined into two control surfaces.
E to F mix on radio will allow elevator and flaperons to work together for tighter loops and tumbling. Put it on a programmable switch. 100% elevator and start out at about 50% flaperon. Channel 2 master (elevator), channel 6 (flaps) slave.