Turn off Suspend, Sleep, Hibernate for user (xfce4)

as the title is says, I want to disable all methods (buttons, commands, etc.) an unprivileged user have to turn a system into any standby-mode (sleep|hibernate|hybrid) under xfce4. I found out that with a kioskrc file, we can disable to save user sessions.

# /etc/xdg/xfce4/kiosk/kioskrc
[xfce4-session]
SaveSession=NONE