Hi Mike, found a perfect way to get what I want from Guacamole and just wanted to share what I did in case anyone runs into a similar issue.
In guacamole-common-js/src/main/webapp/modules/Keyboard.js there's a list (no_repeat) of keys for which the key-down event is not repeatedly send to the server if a user presses the key and and holds it down. I just added the spacebar key to this list and rebuild the webapp. While the application on the remote side is now working as expected, the drawback is that something like a text box of a remote application also won't get multiple key-down events if the user holds down the space-bar, i.e., if someone wants to type multiple spaces in such a window he/she needs to press the spacebar for each space he/she wnats to type on the remote side. For me that's perfectly fine. :-) Thanks for your help, Mike!
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