Automatic dimming á la Screensaver after a period of inactivity

[Helmut]

Greatings,
I enjoy your program on W7 and now W10.
On W7 I used to have a screen saver that was dimming the brightness, so that I could see the contents of my screen dimmed.

I very much liked this, because when you are leaning back for a while in your chair, you very likely are not terribly interested in the contents of your screen and you most certainly don´t want to be disctracted by obnoxious brightness.

Unfortunately they apparently changed the way screensavers work, because when it enables, it abruptly changes to a solid gray - unusable.

By accident I tripped over the brightness key in f.lux, and while this is already a great relieve, it would be perfect if it turned on automatically after a selectable time of inactivity, since it is already there.

Thanks,
Helmut