Although the ability to set the orientation freely is important,
I found it not helpful doing it for every segment.
Since the spline is used for creating tracks, a fair assumption are normals in the world up direction.
I added it as
mode and assigned it as default
Basically, it is the
mode hard-wired to Y.
Then, another observation led to the 4th mode:
This mode is similar to
mode, but hard-wired to the center of the curve hull.
It makes sense whenever the normals face inside its own center (e.g. in loops).
But since there is for all
modes a use case to do the opposite, I added an
This allows to "invert" the intention and flip the normals (e.g. facing world down or facing against its center).
First: Visualization of the hull center. Second: FLIP flag on in POINT mode.