Custom users to control wiki

Hello,
I'm running the wiki (non-lite) version, and I'd like to use the Members plugin to create a sub group of users who having the ability to edit the wiki pages (and all other users just have read access). I'd like to have that special user group show up in the Wiki Privileges section. Is there a way to do this or an idea of how to accomplish it? Basically want more user control over the wiki.

Thanks!