I encountered a workaround glitch for this.
You need a buddy's help and you can "turn off" your headlights. Sadly it
Permanantly disables your tail lights and police lights (if cop).
But get a friend and have them emp/stun mine your car right before you go into a repair shop. In such a way that you enter the shop where your lights are off.
This glitched mine and turned them permanantly off in my police patrol Mclaren F1.
Found it while accident during a persuit.
Thought you might like it!
You cant turn them back on without going into a hideout/command post,
Repair shops dont turn them back.
But if you drive in 1st person, it shouldnt bother you!