Continuing the discussion from Suggestion list (ideas changes and wishes for features and additions):
If we were able to drive the cars, I feel like that would open up a lot of possibilities for the game. For instance, keys could be added as collectables, or lootable content. Explosive gas tanks, could double as gas used for the cars.
An option to armor the car, could also be added, but there are drawbacks, f.e. the more armor you put on, the slower te cars goes, or the more gas you use.
An option to upgrade the cars, or repair them could also be added if nessisary.