Thank's. That's what I was thinking. I would like to get a tune, but I'm about to buy an extended warranty.Honestly, for autocross there's not much to it. Put it in S, go into 2nd gear and let it rip. You're most likely not going to need 3rd or 1st.
Track is a different story, but you should not be at a disadvantage. If you're an experienced driver, I would use the paddle shifters. For a novice, just let the car do its thing.
You can always get a tune which will improve shift firmness and quickness for when you're racing.