1) Each police car has it's own file, so replacing a car that replaces police2 wouldn't replace noose
2) Most uniforms are just texture changes, so it would replace all of the cops uniforms.
3) LCPDFR uses the default GTAIV police uniforms, replacing them would replace them in LCPDFR as well.
4) It uses the default cars.
5) No.
6) ELS is used on alot of cars, and I find less overtaking useful.