Possible to disable fullscreen toggle?

I'd like to use rdesktop as part of a simple thin client set up on a Raspberry Pi for 3 kiosks in the lobby at my office.  My biggest concern is the ability to toggle out of full screen mode with Ctrl-Alt-Enter.  Is this something that is managed through keymapping within rdesktop or is this handled by the WM/DE?  I didn't see anything obvious when browsing the rdesktop code.

I realize an alternative would be to strip down the underlying desktop and adjust permissions to basically not allow anything but rdesktop to be running, but this would be a much more elegant solution to avoid leaving full screen to begin with.

Thanks
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