The stock gear shift especially with the later rearward position is probably the greatest thing about the M3W. I find I'm tempted to shift up just to have the pleasure of shifing down again. When the decision is made to overtake another vehicle, the obligatory down shift is an absolute pleasure being both quick and positive.
Whilst you will likely be tempted by a series of other mods, or dare I suggest fixes, I think it unlikely the gear shift will be one of them.