Setting the transmission (Forza Horizon 4)

People tell me
Bought a t150 steering wheel from thrustmaster, but without the transmission box, and are faced with such problems. If the settings in forza 4 to put a manual box every speed has to switch himself while pulling the petals of the steering wheel that is not an option, maybe this is my first wheel and I don't drive, so don't have time to switch. And if you put automatic transmission when pressing on the brake the car on reverse gear and going back. whether it is possible to configure so that when you press the brake the cars just stopped and box was still automatic, and I would just petals choosing front, rear or neutral gear. Euro track simulator 2 has a control box and then is there ?