I have a Wacom Cintiq 13HD tablet and I'm trying to map the buttons, but it doesn't let me map "ctrl" by itself. It can be ctrl+something, but not just ctrl. How can I map the ctrl key? Is there some configuration file where the mappings are stored and I can edit them manually?
edit: I found out where the button mappings are in dconf, but manually changing a mapping to something like Ctrl or Shift doesn't do anything