There are a couple of mods created by excellent people which improve already existing game stuff.
In my opinion these are must to be implemented to master branch since there's nothing but upgrade of gameplay experience (I mean there's no mods in this list which add new cars, guns, etc. Minor fixes and improvements only)
Fluffy Hair [LINK] - This one replaces boring tail hair under a hat with appropriate hairstyle. Mostly just a fix.
Disable Passive Car Wear [LINK] - This prevents some car parts from cracking out while driving it. There's apparently should be at least some minor