I'm not sure about using tags for those since they should already be easy to search for without missing too many posts or getting too many unrelated posts at the same time.
That gives me an idea of something we could try though. We could have an area on the forum where anyone can create a wiki post where they keep a list of useful threads and other information on a particular topic that they think others can find useful. You can also invite other people to help maintain any wiki post you create (or keep it private if you prefer). Would that be useful? I've only just thought of it so I don't know myself, but it seems an interesting idea.
The list of FAQs could probably be split up into a few similar wiki posts that link to the FAQs in different subjects, too.
Wiki posts can be edited forever, and can be collaborative (or not). I haven't looked into the exact details yet so there may be more to them than that, but I think those are the main things.