[Feature Request] Relative transition start offset

[jpbaril]

Hi,
First, thank you for this great piece of software.

One thing I noticed is that sunset time is always at 50 % of transition duration.
So if I set a 120 minutes transition, then 1 hour before sunset time the screen brightness will begin to be decreased and will continue to decrease until 1 hour after sunset time.

I would like to be able to set that sunset time be at, for example, 10 % of transition duration. That is that screen brightness begins to decrease only just a few minutes before sunset time.

In other words, I want to be able to set an offset timing for the screen brightness change start.