Well... I personally think she could have thrown in key phrases like "You know the planet can't stop me" in reference to getting her way. She also could have had more twisted expressions... she is an 'alien' after all. I realize she was probably supposed to be a normal human being, but if we look at how Sephiroth reacts and her natural abilities as described by Aerith's mother, plenty could be added.

Though, I think the back of Kadaj's skull would have blown off if she had said, "I'm pregnant" XD But seriously, that would just be for my own amusement, and I can't see it happening in a IC setting... unless Jenova really wanted to crack Kadaj.