it would also be great to have an aux switch mapping for bypass A and B presets (but not the Program) simultaneously, in order to bypass the presets, but keep inserts active.
That’s already possible. If you go into System Settings > Global > Global – Pedal CTL, search for A act/byp and B act/byp, assign an aux switch to these and it will do what you want, individually bypass each preset within a Program. It is possible to assign both to the same switch to bypass simultaneously.
