I feel like you’re conflating two separate issues. If you want to “get rid of” cars and replace them with public transportation then you have a mighty big task in front of you and, in my opinion, that has nothing to do with optimizing traffic lights to minimize pollution due to idling. As for pedestrians I imagine it would be the same as it is now. If you think they could improve it then you ought to consider contacting the development team maybe they can answer your questions or implement some of your ideas.