You can of course purchase perlmonks.mobi yourself and just point it at the site... (you'd still have to type that /bare/ by hand, but hey).

I bought codehelp.us for some stupid reason and I tried pointing http://perl.codehelp.us/ at perlmonks. It works, which isn't shocking, but more interesting is that you can login and use the site normally. PM apparently doesn't set the domain in the cookies, so you can login as whatever domain you like.

My hunch is that if someone pointed .mobi at the site, someone would teach pm to automatically cd into /bare/ for that domain ... I could be wrong.