We have veritas netbackup installed and it has root UID of 0.
However, it is setup with a different home directory, password. I believe in this case it doesn't interfere with our root mail.
root: password here:0:3::/root:/sbin/sh
rootnb: password here:0:3:Veritas Root account,,,:/home/nbu/rootnb:/usr/bin/sh
Create a new user with a different home direcotry and UID of 0. Just remember that this is somewhat dangerous. You may only wish to give sudo privledges to a user. edit the /etc/sudoers file to give root command authorization to a user or users.