I'm betting this will be looked into next year. Interplay Sports Baseball 2000 for PSX had this (along with fake throws and other cool dynamics), and it was awesome to say the least. But as long as there aren't any motions that would consider to be a balk in this game, it's okay if it's excluded for now.
Oh, and I don't want to get all fancy here, but N64 only had ASB 2001, not 2002 (that was for PS2). They also had NFL QB Club 2001, which had a very fun QB Challenge mode.