BlendEquation usage?

Trying to apply a BlendEquation.ADD to a PointCollection's color properties. Is this possible? I need the equivalent of ThreeJS's blending property in the Material class:

http://threejs.org/docs/#Reference/Materials/Material

For future visitors to this thread, see https://groups.google.com/forum/#!topic/cesium-dev/HCC0Ybq6UY0

Patrick