I really think they need to make use of alignment. Aside from making your character look more evil if you chose dark it really has no other purpose in the game other than some form of illusion of choice in the story lines..
For example, maybe if you are more attuned to the dark side, if you are a force user, your abilities become corrupted and have altered effects. Purely cosmetic effects of course. But seriously, do something with it, it just seems like a feature that is just sitting in the dust waiting to be played with.