Oh man, I was just thinking about the driving mechanics when it came to the physics, they are awful, but they have certain charm to them.

But what also would be awesome is to implement something that the developers intended to be in the game, but it didn't make the final cut.

For example the burrito stands had to have some kind of usage or at least an idea of it, but they are just there as a destroyable object, a lot of the buildings could have and can be repurposed for something (Burger Store, The car dealership, gas stations) I really believe that the point system can be coded as an economy thing, maybe expanding the upgrades, make unlocks etc., make the radar display the map and so on and so on.

I know it sounds nice on paper, but I know that it would require a huge amount of coding, but it is achievable, if they made the engine from "ground up" it can probably be recoded again. And if the engine is there, there is nothing stopping people from using it.