personalize session list on (KDM|GDM|LightDM|some_other)

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http://askubuntu.com – A bit of an odd question: I want to change the list of sessions available on (KDM|GDM|LightDM|some_other) to a user, without affecting the sessions available to others. Specifically, I have one user that is not very computer-savvy, and I want to prevent the said user from changing session type accidentally. I dont want this to affect the other users. Can it be done ? I'd gladly switch my display manager to whatever one supports this (HowTos)