I added categories to FAQ package as an option.
Take a look at
This instance is from cvs branch oacs-5-1.
Since 5.1 doesn't support /o you will not be able to use the category browser but filtering by category works from the faq package itself.
- Make category browser at least display a result list.
- Enable multiple filters like in bug tracker (next version)
Thanks to Timo, Dirk and Malte.
The steps taken are described here: http://openacs.org/forums/message-view?message_id=198034
I can submit the code if there is no objection.