Bricks casting shadows on other bricks isn't THAT bad. Unless I'm mistaken and there is some technical twist or practical twist to it that I'm too stupid to understand. I know that the Torque current engine wouldn't be able to be upgraded at this point, and the graphics may be "fine" at where they are, and stupid people probably won't understand why their computers aren't powerful enough to run the game.
But you'd have to agree that having some sort of upgraded brick lighting is some nice wishful thinking.