ok. This is for experts only. Looks like you don't know much about SHOUTcast in the first place. SHOUTcast connects to a server, regardless if you are only sending on your LAN. Same with Streaming NSV. To my knowledge, that server is not publicly available yet.
2) The support is in nsvtools ONLY, it did not magically appear in the SHOUTcast DSP.