I am using gdm. If jail is over the top then you cannot know how I feel.
This is probably what you want: http://www.ibiblio.org/oswg/oswg-nightly/gdm2/docs/C/gdm.html#AEN353
Especially see:
2.2.2. Security Options
[security] AllowRoot
AllowRoot=0
Graphical root logins are disallowed by default. Set this value to 1 to enable priviledged user logins.
2.2.5. Greeter Configuration
[greeter] . . . SystemMenu
SystemMenu=0
Turns the Shutdown/Halt menu on/off.
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