Thanks a lot!
Both _ExtractCurvatureGraph and _Curvature _MarkCurvature=Yes are new to me and quite useful in many scenarios.
But I would add that simply being able to visualize the inflection point while creating the curve could add a lot.
Imagine creating a _BlendCrv and having the CurvatureGraph turned on, just by having any visual aid to see where the inflection point is (or if there is any) could help tremendously.
Anything like a red circle or an arrow dynamically showing the inflection point position while adjusting the control points could help avoid creating some issues that might be hard to find later. 
Maybe there is something there already, but I was never able to find.