I'd like to see a more realistic reward system. There could also be a kind of research, e.g. to introduce hydrogen cars and lower pollution. I'd also like if the region could be gradually taken over by a city, to overcome unnatural separation, and smaller towns could also carry the duty of maintaining intercity highways etc. Also, industry products should go to commercial zones, not just disappear out of the city. Sims could drive to parks, airports etc., not just to work. Just a couple ideas