They're allowing users to build their own scenarios and add them as well, so it looks like the intention is to let the complexity grow over time from a basic starting point.

Actually, I wonder whether they might find that people really don't want a great deal of complexity in the decision-making process. People might prefer to go with a simple "minimize loss off life, prioritize kids" rule and leave it at that, because we're used to cars as a physical hazard that kill blindly when they kill at all. People might be more morally comfortable with smart cars that aren't too smart.