"This is true. The only way around this is to deselect cast shadows on the glass object. Which in many times this will work, but I realize that their are many cases where it won't."

Problem with that solution is then the light cones become super XRays beams, and will pass through about anything. I didn't even get into photon attenuation.

Of couse the problem is that the visible (light cones) are really post rendering effects, not raytraced effects.

The above example does not employ the visible light cone with particle/shadow effects. But certainly is a good example of raytraced light effects.

BTW, I compared "Anything Groves" and C5P's displacement texturing on identical objects/textures. Carrara's native displacement maps are much quicker and resource efficient.