@dimasic
Yes, it is possible to make a screenshot in Librerator - but on K3

. I thought that screenshots are a gimmick not needed for reading books - they're only useful for posting pictures on forums - so I thought limited amount of shortcut combinations on K4NT are better used elsewhere. But, it's not hard to modify the source and change one of the existing shortcuts to do a screenshot.
If you can't do it by yourself, tell me what shortcut you'd like to change, and I'll provide you with a patch.
Regards,
Kai