Ahh, that worked like a charm, thanks Charlie!
I just made the directory /etc/e-smith/templates-custom/etc/rc.d/init.d/masq, then copied /etc/e-smith/templates/etc/rc.d/init.d/masq/45AllowPPTP (picked at random) to /etc/e-smith/templates-custom/etc/rc.d/init.d/masq/45AllowShoutcast, edited the port lines, dropped your config command into the console, ran
/sbin/e-smith/expand-template /etc/rc.d/init.d/masq
/sbin/e-smith/signal-event reboot
and voila, there it is.
Now all I have to do is figure out how to get shoutcast to run at startup. On to another search! LOL
Again, thanks Charlie.