Good changelog, it is surely improved.
If you could only fix the page numbers that would complete the hack.
Because if you have like say 500 threads starting with a. Only a number of threads will show on your page optioned in vboptions.
Example
http://www.yourdomain.com/forumdisplay.php?f=(forumid)&letter=d
Should be:
http://www.yourdomain.com/forumdisplay.php?f=(forumid)&letter=d&page=2