Definately going to do that sort of stuff. I already have started with a wrecked police car with smoke coming from the hood. Outside of the driver side door is a large blood stain to show that not even the police of the city is safe on that side of town. This hub location on that map is probably going to be the most detailed, but I do have so many more locations I need to work on, including two more city districts the size of the slums and the central park area. Everything you have mentioned should be included. I have already added a lot of boarded up buildings, broken windows, graffiti, fences, cracked sidewalks, dirty wall textures, and concrete. I also like your idea of chopping up the street some in a few locations..maybe actually have it blocked by a mountain of broken down cars and junk.
As for texture usage, I think im going to stick to redemption textures, mostly due to the fact im too lazy to mess with anything else, but probably more that I actually like to see what I can make and how detailed I can get with just what the game offers. I guess it could effected how amazing the map could end up being..but hell.. I have so much work to do..lol