Bezier Curve Graph Node

Would be nice to have a curve graph node.

Clicking on / opening this node would expand a editable graph such as this one (the image below is from the Unity Tree Creator):

I suppose this node would work like a lerp, with two inputs, and a value [t], but it would interpolate between the two inputs according to the curvature of the graph.

I suggest looking at the Unity Tree Creator to see an example of these curve graphs as they are quite fancy. Something like this in shader forge would be totally epic.