Torque converter and other interesting auto behaviour would be nice, uxwbill made a video on his trucks torque converter where it was jacked up and the wheels turned in neutral, and also the torque converter be dynamic like your cruising and then let off the throttle and then it puts the clutch down to save fuel also the drop down gears have no clutch so it's easy to get stuck, the launch isn't the best either holding at 2200rpm could hold it higher to have a quicker launch, sport mode wou d be nice (sorry for the extreme rant) in short TORQUE CONVERTER!
There is basic torque converter simulation. Pick an auto car, press Q to turn to Real Automatic, and put in in D and hold the brakes. You'll see that as you release the brakes the car slowly lurches forward. You can also see the extent of the torque converter's coupling by looking at the clutch pedal depression bar, in auto it's re-purposed to be the coupling amount.