Hi Marty Jack,
if running a Server with several clients, small desktops give more stability, especially with old clients, therefor LXDE would be a nice alternative to gnome or KDE.
Like I said in my first post, actually all that would be to do is to provide an alternative LXDE-session script as suppressor of HAL, to hide the "shutdown-reboot-hibernat" options in LXDE.
In Debian the user has to be in group powerdev to see this buttons.
On our server we use Ubuntu 9.10 that does not provide a group called power or powerdev, nor a group that couvers those functions.
At this time gnome and kde are the only desktop envs that can be used on ubuntu with ltsp, but we all know the problems of kde in ubuntu, so gnome is left.