I tried to configure copy/paste in Libre Office to be based on the Win key on Linux. The problem is that the Win key is not available in the list of Shortcut Keys. There are mostly combinations based on Ctrl, Alt and Shift. Can I add the Win key there?
Do you think that Desktop / Windows Manager on Linux will pass the Win key to any application? (My Plasma/KDE desktop doesn’t but uses the Win key to show me the KDE menu). Anyway, I’m not aware of any means to extend the list of known keys.
The key is passed to Libre Office just like it is passed to any other app. Why I can’t use it, is a mistery.
On my Linux-Mint Mate system, the keys are controlled by the Keyboard Command > Keyboard Command > Preferences > OPTIONS. A limited set of keys is passed through to the LibreOffice application. The options available to the window key is NOT passed through, and LibreOffice never sees them. So the COPY/PASTE keys cannot be reassigned by LibreOffice