Since the reddit community is now private, I want to ask this question again here :) The encoders intrigue me but I just lack the imagination to figure out how to use them for anything else but volume control..
I have a pimoroni trackball that I use for a variety of things which might feel good on some knobs too. I think that text cursor will likely feel pretty good, particularly if your encoder ticks while twisting. Then you could make one tick equal one arrow key press, and you dial in precise cursor location.