Flameshot
We now use Flameshot Shutter as our screenshot tool which allows automatic copying to the clipboard and editing.
To use it needs to be installed on the invididual consoles, and added to the keyboard shortcut configuration. This should now work for gac-cristall out of the box. For other users the short has to be added manually by going to settings -> devices -> keyboard, at the bottom add a new shortcut for the screenshot key (third-right and topmost key).
It can then be used with this keyboard button:

Setup
(needs this command otherwise fails with QT error):
Then the actual screenshots can be taken using:
(this should in the console provide the output: flameshot: info: Capture saved to clipboard.)