how to make f.lux fading slower?

[fCremin]

Hi there!
First of all thank you very much for a great idea and app.
I use f.lux very long on different devices and it really helps me as I do coding jobs on nights.

Anyway, I just started to use f.lux on retina MacBook Pro and I found that it fades too quickly.
Can we make that curve a bit more gently?

There was something called 'Fast Fade at Sunset' earlier.
Can there be 'Slow Fade at Sunset'? I'd like it to happen two times slower please

thanks