Does it really matter? If the room allows it then so be it. Unrealistic? Maybe, but if i wanted to, I could put racing softs on my daily driver. If you're in the room to cruise, then cruise, if you want to see how fast you can go with every possible advantage, then put on the rs tires and go. It's a game, it has to please one and all, hence the option to put whatever tire you want on whatever car. If you don't allow the rs tires on non race cars, then those who don't use them get there way, if you do, then everyone has the choice to play the game the way they want to. Not how others think it should be.