I modify ls_script.liq to register my radio station with flows.liquidsoap.fm. Perhaps other people who are not programmers would like a simple method to do that also - it's free promotion. You could add a checkbox in the preferences to permit flows registration.
Note: this declaration must happen before the input is consumed (before the stream is output). I put it directly under add_skip_command(s). Change <user> to your radio's user name and <password> to your radio's password. My registration goes to a shoutcast (type 1) output so the streams section is tailored for that: it uses mp3/128k and the URL has no mount point because shoutcast doesn't use one. Icecast, OGG, AAC streams need slight modifications to this example to register correctly.