To restart nsd when started from inittab you only need permission to stop the service. You can do this via an authorized web page that issues a "ns_shutdown" or if you have permissions to the running task (i.e. you are the user that nsd is running as) then you can kill it.
("ns_shutdown" being the cleanest option)
("ns_shutdown" being the cleanest option)
inittab will restart the service as root and you will be back up and running in no time.
if you actually needed to completely stop the service and have it not restart you will need root privileges though.