I've got the 9c programmed for exactly what you are describing on a three position switch. I get the spoilerons by using a 5 point mix (Mix - 6 on 9c). Elevator = Master, Flap = Slave with Link ON. Then I setup the flaperon function to get flaps to drop with up elevator. However, I cannot get the flaps or spoilerons to "snap" into a set position and stay there at a given elevator threshold. I know the 9z can do, but I don't know what the mix is called.