How about create a user root1 and given it to root group ?
It sounds like that's basically what he did, he put it in group zero.
The problem is that most files are not set to that group, so being in it is not that much of a help. Plus, files often have permissions that allow the owner different privileges than the group. For example, it's very common to see files set to 755 or 644, where the group has less rights.
Sometimes hackers will add an additional user with group 0 and uid 0 but a different username, as a backdoor. That way if the root password is changed but the admin doesn't notice this other user, they can still get root.
To the original poster - if you're wanting to set up an additional user on your own system that can do all the things root can, the first question I have is, why? If you have access to the root account, you can use that. But if you really feel the need to do it, the best method is to use sudo as other people have mentioned. And it's best to restrict the sudo access to as few commands as possible, so that the new user can do what they need to without having the run of the entire system.
Rich
