When i say "Realistic grass physics" i dont mean grass deformation or leaving realistic tyre tracks, what i mean is in the event of you sliding sideways onto a grass patch your wheels will dig into the grass and cause you to flip over rather than just sliding over. In my imagination it would be much like the effect mud or sand gives where your car would flip if you're sliding into it but it acts like normal grass we're used to when you drive across it or slide at slow speeds/ drift on it.. As i said, dosent have to leave a mark on the terrain (would be cool if it did but thats an unrealistic thing to ask for as its probably too complicated) but maybe have a partical effect of some mud and grass flying into the air. It would make rallying much more fun given the increased risk of sliding and fliping, and would make the game in my opinion more fun and would make for some more realistic crashes.