Spline Transform Options

The "Spline Transform Options" where added to control if the vertex tangents on a spline should be "Auto naturalized" when moved, which, if both options disabled, the tangents should remain as set when the spline vertex are moved, however, if using "Snap selection" or "Rotation snap selection" with those options disabled, the spline is "Auto naturalized".
Also, the vertex normals of the spline should be adhering to the "streamline tool > Rotation snap selection > orientation" which they do not (bug report for that posted >here<)

It also appears, that if I want to flatten multiple vertex on a spline(which appears can only be done with scale manipulator), again the spline is auto naturalized, regardless of "Spline Transform settings"