Reading through the list, it looks like Han-Wen is very busy indeed these days. So would it be appropriate for me to put out a small bounty for anyone interested in looking at issue #580? Say EUR 50?
If anyone has the time and is interested, please let me know. I'd be very grateful for the fix because it will clean up a series of very beautiful trill spanners in my most recent score (which is now only days away from finishing!).