Batch add control points for splines in Revit

[luna.ye]

When adding control points, only one control point is added to the center of the chord each time, we want to add multi points after click Add Control when modify Splines in Revit 

[duanx]

There is another issue about Spline, you can't edit spline after making an offset copy.

[Intuos5]

Actually, what you want is to be able to "Rebuild" a spline, set control point numbers and even its degree. That way you can also change multi-segment lines (polylines) into splines and vice versa.