threads created by member in specific forums

[kaggy]

I'm looking for a modification that will allow me to add the following stats in a user's postbit:

Threads Created in "forum A": XX
Threads Created in "forum B": XX

I have forums for articles, reviews, etc and I'd like to somehow give members a way to show off how many threads they have created in those specific forums.

If possible I'd like to limit queries so it would be more efficient if there was a cron job or some way to obtain a total instead of running a query for each post inside a thread.