Pro Sites + Domain Mapping possible at signup?


Running all latest versions of ProSites and Domain Mapping, when users sign up to a pro-sites account, they get the option to put their name, card info, and select the domain and name of their site, but is there a way to make it so they can put their domain info into the sign-up boxes right away and have it set up quickly? Or if not, a way they can do this from the FRONT END of their site (no admin panel required)