No. I think that if you want a good vb search engine, you need to go to vbulletin.com and request one as a standard feature. This is something too important to be hacked. It needs to be there for vbulletin to stay competetive with emerging products.
I have a search 'tags' feature on
http://www.eaforums.com/forums It allows users to tag threads and search for threads with the same tag.