I don't understand why you all want and expect Microsoft to completely change the functionality of their software to meet the needs of a very niche market?
They don't make their living selling to the CarPC market. In fact, I bet they loose money with all the people that illegally download the software..
Instead of expecting them to completely change the functionality to meet the needs of about .5% of their market, why not ask them to design a seperate piece of software?
Think about what S&T is designed for. People who are planning a trip. Businesses and traveling sales personnel. It's designed to be a more in depth application that will enable users to design trips and set out more efficient routes.