Im especially against a subforum. Not only do I feel like it would breed elitism (which the WC3 and SC2 mapping communities seem to be especially prone to) but also hurt SC2 mapping in a way. A strong WC3 themed mapping community can boost SC2 mapping itself, but if you try to seperate the WC3 stuff from the usual SC2 stuff, we run the risk of further drying out the SC2 mapping community overall and in the end we will be left with a bunch of WC3 themed mappers while SC2 themed mappers dont get any attention.
Im against any sort of seperation, because its all SC2 mapping and should be treated equally.
I think we can just... try it out and see how it goes. I imagine there isn't near enough activity these days to actually have issues like this occur.