f.lux is great, but I really really really wish it would allow custom control of the timing instead of pegging to sunset. I don't want my screen going red at 4:30 pm in the winter eight or more hours before bed. 10 pm would be about right. f.lux can be manually controlled, but that's much less useful since I'll never remember to turn it back to red at the times I want. "Disable for an hour" is useful once, and really tedious to repeat for six hours.

And in this update: "Movie mode ... lasts 2½ hours." Seriously? Why in the world not prompt for a time duration, or use a dropdown or flyout menu for various 30 minute intervals?