THe first thing that came to mind was "Society" or "Civil society" instead of sociology, but those are probably much too vague.
Well, Nick Gardner and I informally decided that banking and financial accounting/auditing could go into Economics for the interim. We couldn't decide what to do with organized labor.
If some Sociology Editor(s) agreed, we could make an interim assumption that "Civil society" = "Sociology", with the intention of fixing it later.
We definitely have to think about categorization once we get past the charter process. I saw someone mention somewhere that workgroups might be better thought of as interest groups. This would be a more effective way to organize and encourage collaboration and would allow for interest groups like "Civil Society" but it would require that we find another way to organize experts/expertise and items like disciplinary style guides. This might be possible to accomplish through installing editors on an individual basis, based on their actual expertise instead of the broad fields they work in. This gets back to identifying areas of broad knowledge expertise and deep knowledge expertise, so credentialing is difficult.
I agree completely, both that it is necessary and difficult. I'll cite one frustration of mine. I am, indeed, an Engineering Editor. I know very little, however, about mining engineering and mechanical engineering. I have been able to approve Milt's articles because I did do undergraduate studies in chemistry, have a substantial background in chemical warfare and emergency response that deals with atmospheric effects (indeed, I designed computer systems for EPA), and, more under the Computers hat, know a lot about process control.
I also have about 40 years experience in biomedical engineering, specifically including not just being a robot in transcribing the decision rules given me by physicians, but actually developing rules and having them checked by clinicians. As I tell people, "I'm not a doctor but I play one on computers" (are you old enough to remember that commercial?

) Yet, I'm not empowered to rule on something in Health Sciences, even though I have extensive experience, patents in process, and product experience of a sort that doesn't get academic publication.