I would like to disable mnemonics in the menu bar because they interfere with keyboard shortcuts in some applications -- the terminal, for example -- but I would like to keep mnemonics for buttons in dialogs. After having read the GTK2 Reference, I have set gtk-enable-accels=0 but it doesn't work.
EDIT: I have also realized that gtk-enable-accels=0 breaks some keyboard shortcuts in the terminal Control-Shift-C for copying, for example).