OK, I guess I will be the first to respond.
part 1) the short answer is no. Sadly we have not uncovered a solution without mouse.

The Song Form Maker(SFM) is a super strong way to create songs from segments in your chordsheet. Something with many verses and choruses is created so efficiently with SFM.

The SFM is one of the four copy functions that we covered in an EyesFree tutorial product we created for blind users of BIAB.
advert posted earlier
https://www.pgmusic.com/forums/ubbthreads.php?ubb=showflat&Number=676603#Post676603

We are looking into some other possible methods to get access to the SFM using a keystroke or menu. No expected date to share at this time.

part 2)
I tried an experiment tonight with SFM and I did not get extra chords.

Roy