< Is there some reason why you are interested in seeing that kind of curvature analysis?
about level color : only artistic reason for something like landscaping, and possibility to address snow, waters, vegetation
(not in Moi but in any another 2D progs by these colors)

about "Strength of materials" just if libraries exist and are easily adapted why not put it inside moi
(for architectural or engeneering domain :)
But maybe it's more from solid modelers?