MIDI learn: Track scrolling with 1 pot/encoder

Dear devs,
I'm wondering if this feature can be added: when learning MIDI from a controller, I would like to scroll up/down the tracks with one potentiometer/encoder. Unfortunately the MIDI learn feature only tracks the CC and not the value increment/decrement, thus I cannot use one pot/encoder for scrolling up/down, but I have to assign two pots or two push buttons (which are too slow to scroll through the list).

If this cannot be done by editing some script/mapping file, I would try add the fix from the source, but I need a hint where to look for.

Best regards