That slider button beside the gear shifter is the gearbox mode selector. It has S for sports, E for economy and a low traction mode which really helps if you are stuck in ice or sand. Already tried that a couple of times
Also note that the power window buttons are on the center console as well. It was like that in the next gen 3 series as well. I have found that to be more convenient then buttons on doors. However there is no way to lock the windows like in modern cars but thats okay, i don't have any kids 
