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This idea is somewhat of a rethink of the logout (switch user), shutdown, etc. which takes into account if you are in a single-user or multi-user environment.

First, all of these can be merged into a single exit button (as is already presented in the logout plasmoid), which brings up the exit dialog.

If you are in a single-user environment (typical for laptops, netbooks, personal home computer) then the exit dialog will only show the option to shutdown (and reboot). An advanced user who still wants to log out (e.g. to switch desktops) may still do so by launching the logout action with krunner.

If you are in a multi-user environment (typical for businesses, family home computer) then the exit dialog will show the options for logout and switch user (indicating (tooltip) that one closes your current session, the other does not), and will only show (or show disabled) the options to shutdown or reboot if there are no other active sessions (maybe with an administrator override mode.

I think it's really interesting, but also I think that it should be configurable, something like "Smart exit dialog" or something like this, because if someone always is changing desktops, it could be slow to use every time KRunner, also if it's a beginner could be very confuse.

For multi user logins - it should offer hibernate and suspend options (hibernate by default would be best, if other user is running in background)