Seems like vbulletin.com guys already fixed most issues with old vb-bugs in their own install:
http://www.vbulletin.com/forum/bugs.php
Also I see numerous new features added. Maybe we can persuade them to open their fixes and enhancements to public?
EDIT:
Oops, I was wrong about the precedence, just found that vbulletin's own bug tracker appeared first and vb-bugs is just an attempt to re-implement it. Anyway, the proposal to release their bug tracker code is still valid