To simplify operation, we use F4 for "Next Song" and RETURN for "Next Verse". For going back, we use F3 for "Previous Song"; for "Previous Verse", the best I can find is Page-up--Page-up--Return, which is a bit fiddly.
In the next revision, would it be possible to use the ARROW keys?
My aging brain thinks the intuitive way would be:
"up" & "down" for VERSES
"left" & "right" for SONGS
if this is possible?