My number one request would be a way to avoid counties with a history of civil asset forfeiture. Hopefully having the option would draw attention to the issue and I don't want to stop for food, gas, etc in places that use it.
b) I'm going to laugh my butt off when they, in an attempt to be neutral, define it algorithmically and all the rich waspy inner ring suburban enclaves that HN loves because "good schools" wind up on the list too.
I don't see why -- but if that's the case, they could simply offer a way to let users exclude[0] towns the user chooses. As a bonus, this would work for more than sundown towns. Let's say you don't want to go through a town where your ex lives, or whatever.
0: I really mean "increase the cost of travel through these regions" so the app will try to avoid them rather than never send the user through them.