non root root account

[George McConnell <gmccon mindspring com>]

okay, here's the scenario.

i want to create an account that is the same access as root, but does not
have the login name 'root'.

(before you fly off the handle about how insecure this is, or asking if
i'm just a hacker - yes, i know it's not very secure; no, i'm not a
hacker. selling custom software that runs under linux and we don't want to
log in as root. want to login under a universal login set up only for our
company with root access.)

i have been able to do this in other unices by editing /etc/passwd by hand
and adding the line

root:x:0:0:root:/root:/bin/bash
rootcsh:x:0:0:root:/root:/bin/tcsh

then changing the passwd.

this doesn't work on linux. i suspect PAM is the likely culprit. 

can anybody help me here?