Just for your reference, the 6exa does lots of pre-mixed stuff. I used the Flapperon mixing of the 6exa on my UltraSport.

When you set the flapperon mixing, it automatically reduces the normal aileron travel to 60% of the servo travel. This leaves 40% available for extended flaps. I found this confusing for a while because I set my aileron travels before I switched on the flapperon mixing.

So, if you want to go with flapperons, you have to know before you set all your control linkages. Set the radio to flapperon mixing, set the high/low rate ailerons, then see what happens when you play with the twist knob at the top.

My opinion of the actual twist knob is "marginal". I found that it was too easy to bump it, causing the flaps to deploy. I was never quite sure where they were in flight, so I disabled them until I got to know the plane better (and before I add more variables to it's behaviour).

gus

P.S. For the record, I now fly with a Y harness for ailerons. No mixing at all.