Just a few thoughts

1. Shoutcast:
 Since there are 2 versions available (v1 and go figure v2), the shoutcast manager could be copied and slightly modified. The v1 would run normally, meaning creating the user and downloading to setup.
 V2 would download the second version from say an update server for cwp. This way, v2 wouldn't actually change too drastically to keep the code base from changing. AFAIK, the only difference between v1 and v2 is a broadcast auth hash. But that's only if they want to be listed with shoutcast. The only other part about v2 is the way in which a person wants to broadcast and the files are labeled as such. Example:

        sc_serv_basic - shows how to get a more multi-stream setup working
        sc_serv_public - shows how to make a public server from sc_serv_basic
        sc_serv_relay - shows how to relay another source

2. I'd like to know if there's an API or some way to automate the creation of user accounts and domains.