Allow adjustable night lengths
I'd really like the ability to extend the length of the night in f.lux. Most evenings, I end up having to manually turn down the brightness a good hour or two before it starts automatically adjusting. I could set my wake-up time earlier, but I shouldn't have to do that just to change when it starts to change, and it would make the countdown timer wrong. There should be an offset to tell it to start dimming x minutes before sunset.