Correct me if I'm wrong but I guess you are using domain forwarding not actual hosting using nameservers. My question was if they will offer hosting via nameservers.
I don't have my domain set up to forward. I registered a cname, according to the instructions on .mac:
To set up .Mac to use a personal domain name:
* If you haven't already registered a domain name, visit an accredited domain name registrar on the Internet and register the personal domain name you want to use. For information about registering a domain name, search the Internet for "domain name registrars."
* If you're not already logged in to .Mac, go to
www.mac.com, and log in.
* Click Account in the left column on the .Mac homepage, and confirm your login.
* On the Account Settings page, click the Personal Domain button, and then follow the instructions that appear.
* When asked to enter your domain name, be sure to type the entire domain name (including the extension, such as .com, .net) that you've registered.
* When you see a screen confirming that .Mac is configured to host your domain, go to your domain name registrar's web hosting area, and point your domain (by adding or changing a "cname record") to "web.mac.com."
* For instructions on changing the cname register, contact your domain name registrar.