Sometimes we want Formula One-like downforce so we can corner better.
Sometimes we want low drag for fuel efficiency.

So how about including some sort of aerodynamic customization into the body?

Either the option of full on active aero.
Or Manual aero where you choose manually before a ride.
Or the option to go between high and low df by adding, taking away wings from the body.
Or a body shape choice you make from the factory?