I think a lot of these eye problems could be solved by more postwork...I know there are some people out there who think everything should be done in one program...but think about it. You are chaining yourself to a program where most artists replace the entire Runtime library with third party materials right after installing it:) The best tricks I've seen for making eyes realistic is in adding a shadow across the eye from the eyelids, which most people neglect to do. Still, eyes have more depth than a 2D image map is ever going to be capable of. The shader thing might be the way to go...sounds interesting in any case.