Actually, for the eyes at least, I know DAZ got it right with V4. Point the eyes to the main camera, and they do track it properly.

I don't know if an extra bone with a different rotation could be added after the head bone or if that would even work for the point at function. As I said, no one else seems to have cracked it. However, it would be a great help with animation, as the head would automatically tack any other desired object in the scene. 

I'd rather stay in my lane than lay in my stain!