Back in Bing Maps v7, if you dragged the route to the edge of your map, it would move the map in that direction. This saves the user from having to drop that route marker, move the map themselves, and then pick back up the marker to continue altering the route to meet their needs. For example, if you go to https://www.bingmapsportal.com/isdk/ajaxv7#DirectionsModule2, you will be able to try out this functionality. However, if you go to http://www.bing.com/api/maps/sdkrelease/mapcontrol/isdk#directionsGetRequestOptions+JS, you will not see the map move as you drag the route to the edge of the map.
I have looked at the api for directionsRenderOptions (https://msdn.microsoft.com/library/mt750365.aspx) and directionsRequestOptions (https://msdn.microsoft.com/library/mt750373.aspx), but I don't see anything that seems related to being able to move the map as you drag a route. Any help would be much appreciated.