It does support additional lights and recognize shadows -- just not at any defualt setting folks tend to use. It requires a custom light rig that involves "adding up to 1". Produces some pretty incredible stuff, actually.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)