I don't see any reason not to give FAQ edit privs to a set of folks interested in helping write or maintain them. Presumably these would be people already intimate with the code, project or process, meaning known to us, meaning trustable with responsibility, right?
Does the 4.x FAQ give finer granularity of control? Mohan's porting it but I don't think he's done yet. I ask because Musea's using 4.x as their base for their rewrite of the site.
