Emphasis on the optional. The user should always be able to keep the original, 100% pure physically calculated wheel forces if they so desire. 1. Vibration on tire skid/slips-Would indicate brake lock up, understeer etc. In the real world you more feel locked tires thru the brake pedal, but in other titles wheel vibration is intuitive enough, and is real levers only way to go until force feedback pedals become common, haha. 2. Vibration on gear grind-Would be a valuable intuitive indicator when floating gears in trucks, or if someone models the transmission of really old cars with no synchros, etc. Again this is something one feels through the shift stick in real life, but transferring it to the wheel has proved intuitive enough in other titles. 3. Vibration in certain engine conditions-I know Beam already models engine movement natively, but I don’t know, maybe some vibration when you exceed redline or something would be interesting.