The radiation field is an interesting idea but it would get annoying to the locals like the police factions ect and eventually you would have npcs blowing up around you and the people starting would get annoyed very fast seeing nothing but a blinking radiation sign as soon as they started. I think the Fine idea for loitering is a good idea to be kept by the police factions in New York. People loiter for too long after a warning, they get fined. They don't pay their fine, they die. They continue to do it, they are a habitual law breaker.:) Cheers.