In each folder, there are various scripts for traffic/cops in car lot, cheats, difficulty settings, or even removing pursuits.

To apply these .nfsms files you must use the "import script" feature in VLT-Ed 4.6 or higher, and save the file for each .nfsms used.

This is a compilation of scripts I have made that can be applied to any version of NFSMW, similar to my old NFSC scripts pack. 
The most notable one "all vanilla cars" allows ALL car models in the entire game (traffic, semi truck trailers, RX8 Speed T, cops, police heli, bonus cars) to be unlocked through career mode with vanilla-friendly performance and balance.

Other notes:

Cop corvette max performance isn't better, only stock engine power. However, the GTO and heat 1/2 cruisers are better than regular GTOs/Mustangs.