Well, you need to check the system-wide script that is run when a user logs on: /etc/profile. Usually there's some kind of if-statement in there that checks if it is the root user that logged in, and if so, it sets the path accordingly; if not, it sets a different path. You could just add what you need there. Or you could probably add what you need into the .bashrc file in root's home directory. If the .bashrc file doesn't exist, you can just make it.
Of course, there's the manual way:
Code:
# export PATH=$PATH:/usr/local/sbin
which is the same thing you'd put in .bashrc if you wanted.
-- the dudeman