How hard would it be to allow us to dye certain mounts?

I was hoping for this years ago but with the addition of the Regalia, it's surfaced in my wants again..

It would be nice to be able to dye/paint stuff like the Regalia, the Reaper, the Predator, and the Death Claw. It'd also be nice to be able to click on and off the spraypaint on the Reaper.

Additionally, it'd be nice to be able to select the music you hear on mounts.