Most of the other prefs have a lock on them (Login, Users, Network, etc). Displays does not. I found out, by using BatChmod, that if you change the permission of a Prefs Pane (in System/Library/Preference Panes/) to you as the owner and restrict all access to any other user, it eliminates the pref from the System Preferences app when a guest/other user opens it (gone!).
It's back when you log back in to your admin account. Another way is to store the prefs you don't want a guest to have access to in your ~/Library/Preference Panes folder and then take it out of the system folder (after modifying permissions). Not recommended for some prefs panes, though, for obvious reasons.
Anyway, now I can safeguard someone from changing the monitor settings and avoid the "out of scan range" death trap that happens on my GeForce 2MX card. It still does not reset back to the original resolution when a 'bad' resolution is selected, but this workaround keeps it safe until Apple fixes it. Way cool!
[Editor's caution: Although I agree this is a useful and neat trick, you could be causing unseen future problems if certain system preference panes are not where they would be expected to be during a system update. If you use this trick, I strongly advise that you return things to the default setup prior to installing any system updates. I have no direct evidence that this could cause problems during an update, but it seems the potential is there...]

