Description of problem: I would like to suggest an improvement about user permissions to poweroff the computer. When you go to KDE settings to set user permissions, you only have such options: "Nobody" "Root" "Everyone". On a computer with multiple users, it would be nice that some users are able to reboot the computer, and some users no. This will prevent unauthorized users or newbie users to reboot the machine while other users have their sessions opened. Version-Release number of selected component (if applicable): KDE 4.8.5 Steps to Reproduce: 1. Go to KDE system settings, Login 2. Halting (or poweroff, don't know which one is present in English version) 3. See user permissions
FWIW, if we were using the systemd API directly to reboot (as we're now doing it for GDM systems), rather than going through KDM (which always runs as root and uses its own permission system), this would be configurable through PolicyKit. OTOH, the UI in System Settings would then have no effect anymore, and there's still no UI for PolicyKit configuration packaged in Fedora. (There is one at git.kde.org, which may or may not work properly, it is not packaged in Fedora yet.)
(And of course, if we were to make this change, the users could still reboot the system from the KDM greeter, unless you also set the KDM setting to "root only" in addition to setting the PolicyKit permissions. So I'm not convinced it would lead to a great user experience.)
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