Always enable for ... function
I would love to see an always enable for ... functionality.
Or have exceptions for the disable tab.
I have my f.lux set up with disable for full screen apps and I love it. But there are a few apps that I like to use in full screen with f.lux still enabled. For an example when I'm writing a text document (using pages/iA Writer) late at night it's enabled, but when I'm watching a YouTube video on full screen it's disabled.