Creating Super User

How does one go about creating a new super user? Simply making them a
member of the root group doesn't seem to work (this is on RH7.0). Can I
get rid of the root account after doing this? Will I have to change
permissions of /etc/passwd and /etc/shadow after doing this? Please tell
me there is a flag or something to adduser.

Carl Parrish
webmaster
www.carlparrish.com