Personally, i don't like the idea. I like the nexus sites cause of it's specific purpose to be ( for the bigger part at least ) a web community for "bethesda game's mods" ( if we shall put it simple ); and that is at what this community does a swell job. It should be an example to all other web communities how to run something. While expanding it, will cause more trouble and confusion than it will bring good. Personally, I like more specific approaches rather then one for all things, cause in my opinion there is a difference of quality in the long run. But that doesn't mean I don't wish you luck with this, and hope for you that this idea and any other you'll have in the future, will work, and work good. Just my two cents as a nexus and mod user veteran.
