First thing I got when I went to the site i got the attached error. As far at the Google Routing widget, I would suggest having the map zoom to the extent of the route. Also, as a user I would like the ability to click on a portion of the route and have the map zoom to that segment. Also, it might be a good idea to have some type of marker that designates the starting and finishing locations.
Those are just some of the things as a user I would like from a routing widget. I hope this helps you out. I would be interested in the code for these widgets if you are willing to share. Thanks, Don