I gotta say that Maggie has always been a fave of mine. Loved her in the Byrne/Carlin era. That being said, I can't imagine her being anymore of a presence in this film than Hamilton was in MOS. Goyer himself said that he likes to use canon characters wherever possible to fill out tertiary roles, but that term, TERTIARY should let us know that he's not looking to make them too integrated into the main plot.