@foone You could even use sequences instead of only checking which pedals were "clicked" - so
x-x would be different from 1-2 and 2-1. Another sequence could be 12- and 21-
(This idea is brought to you by a rather old programming IDE for oberon which needed a 3-button mouse and used "interclicking": press LB first, hold, then RB, hold and then click MB) (or something like that. it's decades since I used it the last time)