If I wanted to ask a question on meta about the FAQ, how would I tag it as such? I can't use the faq tag since that's used for tagging actual FAQ posts. So in such case, would a about-faq be necessary to identify such questions?
For questions regarding site guidelines or our self-imposed policies, including the FAQ, there are two mechanisms available:
If you have a question regarding the applicability of certain guidelines, i.e. understanding parts of it, please open a support question.
If you question the validity of such a guideline, want to extend, reduce, or otherwise change it, open a discussion question.
In any case, link back to and quote the particular part.
Meta (chemistry) is in principle on free form, open (ended) discussion forum concerning the main site (and its dependents). You might already know, that I'm not a fan of too many regulations, as they usually inhibit evolution and restrict progress, and especially make it harder for newer users to join. Therefore I think there is no need to overregulate it. It's also not as flooded as the main page; the total number of questions does not exceed 600 questions at the moment. As such I doubt that a meta-meta-tag is necessary for further classification of categorisation. Additionally there is already a tag requirement sufficiently grouping similar questions. There is no problem with questions having only one of these tags.
The faq-proposed is indeed for posts that shall, after lengthy consideration of the community, be transformed into FAQ posts.