I would really appreciate this feature (subject to some of the detailed points others gave raised).
Dropping a point off the road edge is the number one error route designers make. And it is very difficult to detect in the design process.
When you take a group of 30 people out on the road, discover the error live, and have 29 people going in a circle because MRA is trying to get to that waypoint, that’s a pretty unpleasant situation!