This is a marvelous idea. Civilians can also benefit from this; they'll be able to create categories for vehicles they use on different civilian jobs or create one category and put all job vehicles in it, that way when they go decide to play as a criminal or police, they'll not go down searching and finding what they need to ride through all this one hell of a mess, I understand that there's a search box at the bottom of the vehicles GUI to search for what you need to use, but implementing the aforementioned suggestion will make the vehicles GUI well-structured.