heh, that should be "Is
it possible....
Running RHEL4, Gnome 2.8, Xorg 6.8 (newer but standard versions under RHEL5, too); I've disabled the Control+Alt+Backspace key in X by adding
Option "DontZap" "true"
to /etc/X11/xorg.conf. according to x.org that should pass the key sequence through to clients (see:
http://www.x.org/archive/X11R6.8.0/doc/xorg.conf.5.html).
Then I have opened gconf-editor and traversed the tree to
apps->metacity->global_keybindings and keybinding_commands, and duplicated the existing keybinding for Control+Alt+Delete (which points to
gnome-session-save --kill), and called it <Control><Alt>BackSpace.
however, while Ctrl+Alt+Delete works perfectly, pressing Ctrl+Alt+Backspace garners no response whatsoever.
Any ideas?