• Admns and Mods have custom titles - are you going to monitor their posts to see when they should be given additional stars? What about other users you have given custom titles too? Going to monitor their post count also?
• Custom User Title Hack - If you installed this hack of mine then you have to use a stars hack if you want automagic stars.
• It's simple and efficient and didn't you (?) complain about having to change the fieldtype of usertitle as it doesn't hold that much info by default.

I think it is something that should be included by default with vB, with a toggle of course.