First, I wanted to mention that the feature you implemented and showed on Vimeo of adding chords above the bass line in the Handel score, is really wonderful!!
I think the main problem with the way I set things up in the script I am trying to write, is that each time the cursor is moved to the staff up or down, it goes to the beginning of the staff (which I somehow had not noticed previously). If I could somehow tell it to go to the last note of the staff each time (not the end of staff, just the last note)? Advice is appreciated, but I will search for a method in the meantime.