I don't think we can do custom severities from memory, All-thought a RfC Component under Mediawiki could probably work, or people just putting it in the correct section and including RfC in the title.

(In reply to comment #1)

I don't think we can do custom severities from memory, All-thought a RfC
Component under Mediawiki could probably work, or people just putting it in the
correct section and including RfC in the title.

In the title? I respectfully disagree, it should be controlled term, to facilitate the search for such entries. May be a keyword, but keyword use in bugzilla is not so easy as to select a severity (category).

I disagree with this idea entirely. Bugzilla is an awful forum for RFCs; its best for concrete actionable items. For ideas that still need an RFC, I highly recommend mw.org or wikitech-l.

We have a place for this on the wiki, which we're already trying to nudge people (including ourselves!) to use actively:

http://www.mediawiki.org/wiki/Requests_for_comment