Right now the launcher runs a local HTTP proxy that recognizes .SAFENET tld’s. The addon will run through the proxy and redirect appropriately.
As far as registration, in my attacking the name service post @digipl mentions that @dirvine suggested limiting DNS records per user.
If you can do a little research, I too would be interested to find out if this restriction is going to be implemented or not. Also if it is per persona or per login.