Just curious: have you watched any of these games to see what kinds of mistakes the AI makes for various settings of the parameters in your scoring functions?
Also, I'd be interested in doing offline learning. For example, if you have some formal way to record the actions taken in a game, you could ask pro players to submit their games. Of course, this would require Blizzard to allow a replay mechanism like it does for starcraft. But it would make the AI design process much more interesting than exploring game trees (without perfect information) or greedily picking the best single move.
Also, I'd be interested in doing offline learning. For example, if you have some formal way to record the actions taken in a game, you could ask pro players to submit their games. Of course, this would require Blizzard to allow a replay mechanism like it does for starcraft. But it would make the AI design process much more interesting than exploring game trees (without perfect information) or greedily picking the best single move.