That could work. But I would reccomend using sudo to be safe. IIRC you had alot of issues getting RH to work on your box (from here and over on the RH list). I dont want to reccomend that unless I know it will work. But I use sudo for EVERYTHING, and have zero issues.
Sudo is like su, excpet it is for individual commands. Like ::
sudo rpm -Uvh *rpm
That will allow a normal user to upgrade all of the RPMs in the current directory, presuming that the user in in the sudoers file. at the cli, as root, type /usr/sbin/visudo and edit the file accordingly. It is well commented and towards the bottom you can see where it allows individual users and the group permissions (allow only johndoe out of group dudes as oppesed to all of group dudes to run sudo). I just gave my account full access. Noone else.
So after saying that, take for example you need to edit a nonpermitted file. You like ... kwrite as your editor, you can make a launcher that has the command (with run in terminal box checked, so you can type the password) sudo kwrite or if you prefer to do su, kdesu kwrite (which will ask for root instead of your user accounts password).
After thinking (I dont know if this is a security wise safe thing) you COULD add yourself into the root group. And then change perms for the group users on the dir. Its a thought ...