Just to be clear, you’re saying you want the ability to go to a previous part when using the footswitch, while the footswitch is set to do something else? I may be misunderstanding!
As of version 4.1.x the BeatBuddy has 3 states for footswitch behaviors: While playing, while stopped and while paused, and all three have the option to switch parts both next and previous parts.
You’re asking for the ability to set a tap and hold behavior for each instance?
Let me know thanks 