In the future games, or even FH5, adding a function-wheel keybind so that when you press it (or hold), a UI “wheel” (circle) containing lots of different functions and toggles appears would be a huge game changer not only in gameplay but also immersion.
Different functions that could be included to toggle on/off or change:
-headlights (multiple states)
-horns (preselect up to 3 for quick use)
-units of measure (Metric, Imperial)
-disable/enable head to head races
Make positioning of where certain functions are on the wheel or what functions you want included to be customizable.
This function could replace the photo mode button on the d-pad, but a quick press would still automatically go to photo mode, but holding would bring up the wheel (example: Overwatch communication wheels)
Let me know your thoughts and feedback and concerns!