I guess the most difficult part would be where to integrate those settings into the UI, since the functionality should be already there, technically speaking. But i could be wrong on this.
I image different camera settings and sceneries would be an addition to the game. I agree that people will be not specifically asking for this, but you could integrate the photo mode not just for pictures but also integrate into as a part of the campaign. Image you go into production or sale you see your car in a showroom, or on a podium at a press event etc.
To implement this in a meaningful way would take a while. As it is purely cosmetic and a “would be nice to have” thing, it is far down on the list of priorities. Will be easier to do in Unreal Engine though.