In the OS X client, Control-Option-F toggles fullscreen.  I would like to pass the chord through to the server, because C-M-F in emacs is forward-sexp.  Is there an easy way to do that?

I've tried putting a file at ~/.x2go/config/keystrokes.cfg with the following contents: 

<!DOCTYPE NXKeystroke>
<keystrokes>
</keystrokes>

However, Control-Option-F still results in toggling fullscreen.

Stack Exchange question about this.

Best regards,
Alex