To be honest. I've seen this done in test drive. Looked awesome, in cars with paddle shifting he just flicks the paddle, and in manual cars, when it nears the shift point he reaches down, and when you take your foot off the pedal he reaches for the stick as if to shift down. It would only have to have a central point, and an animation to each gear in H pattern. ie, 3rd to 4th, animation returns to central point and then into 4th....5th to third would look weird because you have to click twice (unless you have a g25).