Kick me if there's a way to do this, but I've tried setting the advertising rate to 0 and it reset it to 5 minutes for me. The best I can do is set it to 9999.
... while we're at it, I currently can't start a fileserver silentely, I get "ERROR > 421: Unknown command: ADVERTISE" and the server doesn't active. I don't have the patch, which I assume fixes this, but if it doesn't...