ron,
I don't think it would be a bad idea to flag pure [insert renderer here] but I don't think all those images should be in a Pure [insert renderer here] gallery. The problem is that every category has that same issue, not just poser. If you did as you mentioned and everyone who used postwork posted to Mixed Media, I'd venture to say 3/4 of the gallery if not more would wind up in Mixed Media. Then you'd have Mixed Media and Other. Course I guess that would simplify things (grin). Maybe a flag like nudity would be something for the admins to consider. Otherwise, I think it should be left the way it is. Besides, is there really that many true 100% Poser images?? I have been guilty of what you are talking about, but usually only post in Poser when I think it is the heart of the image's creation, rather than just a small part and most of the time I do post in Mixed Media.

My 2c
ShadowWind