I want Waze to add new features:
1. Crowd source bad roads. Some interstates are atrocious, I'd happily turn on [X] avoid potholes and uneven pavement. Maybe use the motion sensors to do this automatically.
2. Get me know altitude. This would made planning trips through the mountains way better - avoiding high mountain passes would be very helpful.
3. Overlay radar when thunderstorms are hopscotching across the land.