I got my Mac to tether through my N900 using that unsupported BT DUN script

The script runs as root, which I created by ssh'ing into the phone as root (with openssh server installed). What is a good way to just get it to run whenever the phone boots and continue to run? Hack a script into the /etc/init.d dir and link it to /etc/rc2.d/ (since it appears that the default run level is 2 on this).