Is it possible to have a system wide configuration of buttons offered when user clicks on 'Quit'?

[wtautz]

Hi, I was wondering if there is an easy way to have a system wide
technique that would allow me to remove the 'restart', 'suspend',
'shutdown',
'hiberate' buttons when a user clicks 'Quit'. I have managed to get rid
of some of these
by using the xfce-settings manager. It would seem that this would only
a user to manage his/her own settings?

fedfan