Hello,
"Dim between turns" seems to be invaluable for conserving battery life, so I use it almost all the time. I have noticed, though, that I generally want to see where I'm going somewhat earlier than it wakes up the screen, so I often have to manually wake it when I see a junction coming. This doesn't take long, but it takes longer than a quick glance.
It's quite useable as it is, but it'd be even better if I could adjust the amount of warning that it gives by default.
Thanks!