Disable Chromium Ctrl+T, Ctrl+N, Ctrl+W, Alt+F4, etc on Linux in kiosk mode?

[Cory Geesaman]

Is there a way to disable Chormium's shortcut keys in Linux? I've tried the --app and --kiosk flags but they don't disable the shortcuts, you can still create a new (though unusable) tab with Ctrl+T and can create a new (fully functional) window with Ctrl+N. Also, Chromium appears to do it's own check for Alt+F4 because even though I have it disabled in the window manager it will close Chromium. How do I disable all the shortcuts within Chromium? Window manager is matchbox, started with xorg + nodm (the default lightdm+openbox system didn't allow me to auto-restart the session or get rid of Alt+Tab).

This is for an embedded system using node.js in the background to handle hardware io, but it will need a network connection to function so I want to ensure users are locked out of the browsers (the various Ctrl+Alt+F* shortcuts have already been removed, Chromium is all that remains in making it a real kiosk system). Alt+F4 isn't a major concern (though it would be really nice to get rid of) because when Chromium crashes nodm will automatically restart it and it handles the Alt+F4 somewhat reasonably (black screen, flashing white, then it's back up - it's not a security concern just a severely ugly "feature" people might stumble accross).