I finally understood what control points, and how to use them to edit a route. But I have a couple more questions:
1. To remove a segment between control points A and B, the user must remove all the control points between A and B, and drag and drop the route, adding control points if necessary. It's just not possible to make A and B "sticky", and simply drag and drop the route between the two control points in one go. Correct?
This is very time consuming when there are at lot of control points between A and B.
2. After creating a route, I'd like to add a "round-trip section" to go to a location and back, and resume the trip. For instance, let's say the route goes from Boston to NYC, and I'd like to edit the route to be Boston, Montreal, Boston, NYC.
I didn't find a way to add a segment in an already existing route. Is there a way?