The quadratic Hermite spline is now available in the Origin branch. It works pretty much like any of the other splines with the exception of the method to manually assign the start tangent. The default is automatic selection of start tangent, which uses the reflection discussed in this post. A screenshot is provided below.

The blue curve results from plotting the low-level utility upon which the Degrafa spline is based. It is plotted old-school, point-to-point with manual start tangent. The red curve is the Degrafa spline fitting the same set of points in MXML with automatic selection of start tangent, and approximated by quadratic Beziers in the Degrafa command stack.