I'm not understanding the big problem  with registration.  All you need to register is a working email.  I'm not even positive that it has to work....does agtalk return the password via email or just use it as entered by the user?   I've seen both at other sites.

If they don't want anyone to know they are here, too bad, because the log will show that anyway.  If they are worried about some nefarious entity stealing their identity then they can use a blind email address and alias.....or just crawl back in their hole and vegetate for a few more years.