vprp, we have this setup running at our site:
www.arcanetek.com (wiki is at wiki.arcanetek.com and vb at forum.arcanetek.com). All these subdomains are hosted by the same server, The only difference is in the cookie domain settings.
Clayton, if you can wait, I would suggest you wait for the next build. It's been due for two weeks now, so it is bound to be released any second...