Generally speaking, aileron movement is opposite elevator for flaperons and in same direction as elevator for spoilerons. I have mine setup with proportional travel throughout the elevator travel. I may not use full aileron travel in flaperon mode but full up elevator gets the same amount of down aileron as full down elevator gives to up aileron. Clear as mud huh! I wrote that last bit and it's even hard for me to understand it after rereading it.
Waterfalls can be done in either direction, flip to the belly or to the canopy. Spoilerons, i.e. Down elevator and down aileron in a hover condition makes the plane pivot around the CG moreso than flaperons which make the plane want to fly forward and loop. My EF Edge 540 does a better waterfall than most of my other planes and I haven't even added flaperon or spoileron mixes yet! I may not ever put them in. It flies so good with just a basic setup I hate to change it!
basmntdweller