I know of the existence of the fuel mod (can't remember the name of it) but I have a couple major gripes with it. First problem is it depletes fuel way too fast, second problem is the infinite fuel tank. I want it to drain slower and have a pref for a fuel cap.
For the vehicle damage I would use rampaging vehicles but that is way too powerful. I want the damage to be less powerful and if possible depend on the impact, maybe add in some sort of damage indication like smoke if possible. A complementary item for repairs would be nice too.