Clean shutdown directly from gnome2 ?

[christophe barbe <christophe@cattlegrid.net>]

I noticed that when you start a gnome session as root, the logout dialog
box allows you to shutdown the computer. This is convenient because you
don't have to restart gdm to shutdown.
Now I wonder what need to be done to allow a normal user to have this
shutdown option in the logout dialog box. I guess is just a matter of
giving some privileges to the normal user but I have not figured out
where. 

Has someone an idea on how to do that?

Note: I am aware of app like gshutdown but that's not what I am looking
for. There is a clean way to do that, so I want to figure out how.

Thanks,
Christophe 

-- 
Christophe Barbé <christophe.barbe@ufies.org>
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