I need have the rpcbind deamon running in 'insecure' mode all the time. What is the right way to do this using raspbian?
I would create a script in /etc/init.d and use update-rc.d to register the script, that way it will start at boot and you can make it close properly at shutdown.
See this blog post for instructions and an example script www.stuffaboutcode.com/2012/06/raspberry-pi-run-program-at-start-up.html
You can edit /etc/rc.local and include your command before its exit statement.
sudo chmod +x /etc/rc.local to enable it
sudo reboot to reboot and see if that has worked out for you.