I can't tell you how many times my wife has gotten in the car after my kids have adjusted the passenger seat and she has to fix the seat back to how she likes it. Another profile button for passengers to save settings would be great.
It would be nice to be able to find a destination within your current route without cancelling your current trip. Example: You are driving from Orlando to Tampa, and halfway there you decide you want some coffee.
When I have music playing, and navigation tries to tell me something, the two both play at whatever volume I have each set at. It would be nice to have the music fade into the background or mute completely/pause while nav is telling me the next turn.