RE: JR X-378 flaperons
It sounds like many of the directions you are following are for other systems. With the 378, I recommend either inhibiting the flap lever in the LEVER function, or using a program mix to cancel the effect of the flap trim lever on the ailerons. There isn't a switch that is automatically going to work the ailerons as flaps, you would have to set that up through a built in mix or a program mix. What switch is moving the flaps and what mixes have you set up?