Guidance Mode:
Disable screen-saver/monitor power settings - To get rid of the annoying screen blanking automatically when the screen saver starts up. I wouldn't use this setting in the planning mode - only when it's in the Guidance mode.
Darker colors for night - Use darker colors in the night mode, mainly for the color of the buttons on the right side of the screen. The display is too bright to be used in night mode. A great example of good night colors is Microsoft Streets & Trips 2007's.
Automatic Day/Night according to sunrise/sunset for current location - My computer uses the eastern time zone, and the day/night setting uses that time. When I'm in different time zones, it's wanting to be in the wrong mode at the wrong time of day. This could be expanded to also calculate the sunrise/sunset time of the current location.
Delete/Clear route confirmation - On too many occasions I've accidentally hit the 'Clear' or the 'Delete' button while in the Guidance Mode. There should be a confirmation pop-up asking whether or not to actually delete/clear.
Delayed auto-snap - Many times I want to drag the map window so that I can see further down the road just so I have an idea of what is coming up. CoPilot automatically re-places the map in the original location. When dragging the map (even with the auto-snap enabled) there should be a delay built in so that you have a chance to look at the map, maybe 30 seconds.
Local weather - This would require a full-time internet connection, which I have. Add a 'Weather' button to the main screen. Inside this menu would be options for Local weather (current location) and Destination weather. For the local weather, if the vehicle is stopped, maybe a 36 hour forecast for the local, otherwise just give current weather conditions. For the destination weather, provide a 36 hour forecast.
ETA to final destination - Along with showing the ETA to the next stop, show an ETA & Driving Miles remaining to the final destination on the main screen.
Keyboard shortcuts - Provide keyboard shortcuts to the main buttons on the Guidance Mode
Smaller 'buttons' - Make smaller buttons on the screen in order to allow for a larger map display.
Default 'Add POI' - Allow to search from the same POI's set in the POI Alert setting to make adding a POI stop easier while in the guidance mode. 99% of the time when I need to add a new POI stop to the route, I use the same searches as what is set in my POI Alert settings.
POI Alert Sound - Provide an option to play a sound whenever a POI Alert pops up. A lot of times while I'm driving, especially at night, I turn off my display, and therefore have no idea when a POI Alert has came up.
Planning Mode:
Current Location as Start - Add this as an option to the route planning instead of having to manually add the current location with an address.
Scheduled stops - Allow times to be set in the waypoints/stops to provide a better final ETA. For example, Leave the current location at 8am, stop at waypoint 1 for 10hrs, stop at waypoint 2 for 10hrs then continue to the final destination. This would be an EXTREME advantage to Over-The-Road truck drivers. Again, for an example of how to do it would be Microsoft Streets & Trips.