It would be cool to see some realistic things about the transmission. Here are some I would like to see: Transmission Temperature (During heavy loads, and in race cars) Transmission Starting (The player can push the manual trans car, with clutch pedal down, and in 1st, when removing the clutch pedal axis the engine will start) Realistic Gears (In Park, the transmission will not move the driveshaft, currently, park enables the brakes. In Reverse, we get reverse sounds. I know thats in More Features mod. In Neutral, the transmission is open, and the driveshaft moves freely. In Drive, the transmission is connected from camshaft to driveshaft. In 2, and 1 it locks it into those gears. Currently if you were in 1 on an automatic, and was in gear 2, it would be in 1, then shift to 2 and not goto 3.) Transmission Wear (Grinding, blown, not oiled, etc) It would be cool to see that simulation.
Transmission starting is implemented, park is implemented (locks the transmission), neutral, gear 1 and 2 holding is implemented, gear breaking from shifting without the clutch is implemented. "Drive" is implemented including a torque converter simulation with lockup. You just need to use realistic gearbox mode to experience most of those features (press Q or select in the pie menu).