I have tried a few keyboards with pressure triggered 'whatevers', and I must confess, never got on well with them. I guess I have a pianist's touch or close to it, and I could never stop the 'whatever' from happening when I got into fff passages and started playing strongly!

To keep playing and 'controlling' separate as much as possible, I prefer to transfer to my feet as much of the arranger control as possible. Definitely having all 4 Variations (with auto-fill ON) at my feet relieves my hands (especially my LH) from having to stop playing at least 90% of the time, and in this case, makes sure that enthusiastic playing never accidentally triggers the wrong thing!