A feature in Horizon 5 I’d like to see, would be the ability to save custom colors. Having a custom colors tab while choosing paint would be so nice, maybe you could just add a keybind/button press to the previous colors tab that would add it to your own presets.
In FH4 I like to paint my cars and their wheels certain colors, but if I liked a color, I would either have to remember the hue/saturation/brightness combo, or modify a car that has that color already to add that color to “previous colors”, which gets cleared on when closing the game. I’ve recreated bronze or gunmetal for wheels hundreds of times alone.
Being able to use saved preset colors would speed up painting my many cars. Especially with the different materials like matte or aluminum, since there is only the one default color (at least in FH4).