If you hold FN while moving the trackball it should function as a scroll by default.
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I was just going to post this. However I don’t know if this was the case before updating the firmware of the keyboard, so maybe the reason some users are looking for a workaround is cause they didn’t update it.
did your uconsole come out of box this way? mine definitely did not
you can update stock firmware to newer version to achieve fn + ball to scroll
or migrate to QMK and get select + ball as scroll