As far as I know, we have yet to consider the "screw" variation of the NES games. As far as the label variations go, I'd have to check with tynstar on that. (but I don't think we are currently)
I think we have talked about this in the past, but did not have the proper database for such a thing (IMO). Now, the database could feesibly handle such variants with no problem.
I'll point a few Admins and Editors towards this thread for a discussion.
Edit: Also, welcome to RFGeneration!!!!!