Hello,
There are custom vinyls you can apply to your chosen vehicle once unlocked. You can also change the colour of the rims and car itself.
However, allowing more customisation in future games such as body kits would be cool. It's just that most of the cars in the game wouldn't have body kits in real life, such as the McLaren P1, therefore it would be pointless to add such features in the game. If a vehicle like the R34 of 370Z was in the game, it would be understandable.
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If I helped, feel free to give XP and mark as solution. I appreciate it and it really helps.