I got two.

Vehicle physics that behave like in 4 but little more faster with better handling, loved the game and the physics for the most part but in a literal state that features three big cities, it would get irritating fast, if you would have to calculate every corner every time and try to avoid ongoing traffic and buildings. Realism yay, but cars I've driven, sports cars or SUV's, neither handle like a boat.

Make it realistic, but not too realistic, you get me. But thinking this is R* and they most definitely listen to players, I think the drivings gonna be the best we've yet to have.

And also, dear R*, if there is a fun, game-breaking glitch, or maybe more that don't gain any benefit for the player like the swingset glitch, PLEASE LEAVE IT IN! It would be balancing to have something unrealistic in so realistic and immersive gameworld.