Hi @pascalius, thanks for your suggestion. I wonder if the user presence state is of use to you? Brief description @ https://tobii.github.io/CoreSDK/articles/states.html
This would allow your program to be aware that a user is present regardless of whether eyes are open or not. In any event, I will pass along your idea to the developer for further consideration. If you would care to expand on your intentions, that would be helpful.