[Users] I need save("location") but with some change ...

Hello, I currently use this code : if (is_method("REGISTER")) { if (!radius_www_authorize("mydomain")) { www_challenge("mydomain", "0"); exit; }; xlog("new user : $au"); save("location")) ; exit; }; But save function add a new item in location table with these param : Username, domain, contact ....user_agent, socket, methods. Username use by register module isn't Authentification's username how can I change it ? Is it possible to add more location for a user ? ( Like username and numer phone ) Thank for your help.