It would be awesome if the the bus route numbers that are accessible at each station were listed when you click on the station. Also, you should be able to enter in a bus route number and see all of the metro stops that you can catch it at. Would be VERY helpful! As a piggyback idea, you could also include a "directions" button from the map that would kick a user out of the app to Google Maps. They have bus route info there. (At least they do for Beijing.) I use it all of the time, but would rather use a travel/subway-centric map program.