I think it would be cool if you were able to create a company (as apposed to just a model of car) and as a company have the ability to build a brand. I think this would be able to improve the way that cars are sold - High brand reputation = more loyal customers = more cars higher % chance of a sale.
Similarly, this could then be used in the sales of cars with, for example, environmentally friendly upgrades (such as electric engines - something that could be added to late game research tree) and then because they are better for the environment and are seen to be ethical, it could improve brand image, and therefore increase the % chance that someone buys the model with them specific upgrades, and could make the customers more willing to spend a premium price for the model.
Loving the game so far, keep up the good work