i think a better question would be to ask why there are drive pins inside the gearbox at all. i am sorry to say that, in my opinion, its a really poor design especially when there is potential for them coming loose and wrecking the gears. its a pity they didn't copy the B4/X6 gearbox style for this car - funnily enough there are no drive pins in those gearboxes - its almost like they knew what they were doing
on second thoughts, maybe they will just fall out of the gap at the rear of the gearbox before causing any damage !