Giving admin the same rights as root is the worst idea of all.
Smart admins always log in under their own account and do as much as possible under their own account, only becoming root as necessary, since it's so easy to destroy your server as root.
In fact smart admins use suexec on programs they need to run as root, so they only have to log in as root when they absolutely have to get access to a directory that only root can read.
I'd give the root password to as few people as possible. And have them log in as their own username, with root permissions, and then su to root as they need to.
If for some reason you can't share the root password, then you can do what I said previously but use 0:0 as the two numbers.
However, then any such user can log in and destroy the entire server by simply mistyping a remove control.
For example:
# rm -Rf /home/jeff
will delete everything in the jeff directory, and any directory under it, while
# rm -Rf / home/jeff
(notice the "accidentally" added space) will delete the entire server.
Jeff