[X2Go-User] How to change OS X x2go client keyboard shortcuts?

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. <http://superuser.com/questions/1037305/how-can-i-change-x2gos-keyboard-shortcut-bindings-on-os-x>

Best regards, Alex