This is the current most recent version of Clothoid2pt script, with two sliders.
Got rid of negative point numbers.
Added Max Smirnov method of reducing slider flicker. (per ArchimedeanSpiral discussion)
Added Max Smirnov method of clicking on slider label to reset slider to midpoint.

(Hopefully there is not some configuration which does not work.)
The script still has lots of comments, which could be removed to a text file...

- Brian

Maybe Moi version 4 could have a method to make available endpoint tangents of a curve?