The only thing I can find leaves you with only Log Off, Switch User and Lock. The same as richc46.
You don't say which Windows 7 you are running but if you've got gpedit.msc (I haven't so I can't try this) maybe
this link will do it.
I've also found the shortcut "command" for shutdown:-
"C:\WINDOWS\System32\shutdown.exe -s -t 00"
Though what you would do with that....
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