When I first heard about SC:C, and the crowds and new gameplay and whatnot, I always thought that you should be able to free-roam the city, breaking into houses and offices, killing random civilians, and if the need arises, breaking out of jail. Of course, there'd still be missions. I was just thinking you'd need to press start and go to a mission menu, and hit "Start Next Mission" or something like that. Just an idea...