Bart - that makes a lot of sense because in a way, a level of control is ‘reliniquished’ by constraining the spline to the surface to begin with, as the acceleration of the spline will be driven more by the points on the surface and the surface geometry itself. Whenever SW sketches ‘jump’ as they do in this feature - usually accompanied by a bunch of red warnings - its frustrating and makes me question what the programmers are trying to communicate or accomplish.
Thanks.