Hmm, I don't like this update. I don't want flux to be on my schedule. My schedule is bad - that's why I use flux. The point of it is to help regulate my own rhythm, not reinforce my bad habits.
Our "classic f.lux" mode turns off all the wake time scheduling, so you can just use sunrise/sunset. But if you can pick a time, our super-warm colors are available and will help a bit with scheduling.
Back before I had a toddler who wakes up early every day, I didn't wake up the same time every day, so it would have been a really hard question to answer for me too.