Hey, welcome to the forums. Just follow the rules and everything will be nice; have a good stay-
Well, no, it's not possible to play it on one keyboard to our knowledge. I spent the past 30 minutes messing around with the configuration files for the controller, but when it came down to it, I got it all down like it should be, but the player refused to move ingame... So I take it that it's not possible...
I don't know why they took it out the option though, I suppose a guess would be that they felt that it was unnecessary.
This thread takes up that you can do it if you have two keyboards:
http://www.nbaliveforums.com/ftopic27343.php