I've only read this through quickly, so I probably just don't understand. But there is a place for different enthusiasts to sign their name: you simply add [[Category:_______ Authors]] to your user page. No?
Denis clarified what I was getting at earlier--thanks, Denis.
[[Category:_______ Authors]] is a start, but within each category there are lots of subdisciplines. Rather than continue to break down workgroups into more sub-workgroups, we could have a simple wiki page where people can list what subdiscipline they mainly focus on.
So, if an author is working on an article and wants some input/feedback from another enthusiast/expert on a subdiscipline, they can click over to that page and find someone with that specific interest. I'm looking at this from a more proactive 'authors actively collaborating with authors' stance than just initiating articles or editing existing ones--if authors want a hand with a specialist sub-topic they know there is a place where they can find another enthusiast to ask.
I'll work with an example and hopefully put it up shortly.