I could use trills, mordents and turns/gruppettos, holds/appoggiaturas, too. This is especially useful with classical music, but occasionally is also needed for Jazz (usually when notating classical-to-jazz crossover, so still technically classical). I just spend an hour diligently searching the help file, the forums and Google for any information on how to get a mordent or gruppetto in BIAB, until I found the above post.

The importance is in generating/printing lead sheets. As you probably know from your obvious jazz backgrounds, the cleaner the lead sheet, the easier it is to play off of. If the page is all ink, it's hard to get through a song in rehearsal, let alone at a pick-up gig. Notation, to me, is where BIAB still has some opportunity for improvement.

And Lord, wouldn't it be nice to have NC for no chord instead of B7. or B7.. or B7... Not only is it counter-intuitive to musicians to think that way, it never prints out in any useful form for others to read.