You're welcome and there are no stupid questions in my opinion, so don't worry about a thing.
As stated in my answer to your other thread, I'm not aware of a 'role' being used in Linux, at least not within a standard Linux system. I've read (Google) that role based access control is something that can be used for example in SELinux or in other distros like Gentoo using Grsecurity but I'm not familiar with either of them. Standard Linux doesn't use the role based access/authentication control so I'm afraid that unless your software works with things as SELinux, you'll have to work with an alternative to the role based system like group based for example, or sudo.
As you stated; the options -R and -P are not available in the useradd command, at least not in the version I have running with Slackware 13.1.
Last edited by EricTRA; 09-03-2010 at 02:25 PM.