Would it be possible to add 4-point and 5-point conic creation to V6 ?

The 4-point conic uses four points and a tangent line at either the first or last point.

The 5-point conic generates a conic through five points, no tangent lines are used. An option for this would be to generate just the curve through the points or to generate the entire ellipse if possible.

I have used both types of conics very extensively in CATIA and it would be nice to have them available in Rhino as well.

A super ellipse generator would be nice as well.