So, playing around in the game I am working on - Now even more convinced this is a good idea.
Test was: using the sculpt tool, and creating a tiny “dip” (using shift+click) along the seam of two terrain segments
I now experience a tiny bump when driving over at speed, on my bike with spheres for wheels, instead of bouncing into the sky and doing a flip.
I really am interested in adding this to core unreal engine, but am reluctant to invest the time in doing it if there is no chance of a PR being accepted…