Cars don't go very fast and you can't do much with them. I have some ideas...
I think that there should be a car race with nitro or fast tapping or something like that. I also strongly believe that we should be able to do a driveby in the passenger seat or be able to do hit and runs. We should get more creative with the cars, like adding speed boosts or better engines, decals, jumping out while driving at the cost of your own health, repairs, and maybe an NPC taxi service. Those are my ideas