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I'm not familiar with the Alfa BAT concepts. It may have been the least bad solution to the problem. Your basically right about how the vertical fin works on an aircraft, but without a rudder the fin would tend to increase the problem, not decrease it. Light aircraft do have this problem when taxiing in high winds. You have to use aileron into the wind to reduce this tendency(and also keep the wing from picking up.) As to adding a rudder, you've added a lot of complexity now for uncertain benefit. True, this website is full of people who've added complexity for small fuel economy benefits, but I still think its possible that a fin/rudder combination, would cost you most or all of your drag reduction. Keep in mind that if you can really aero the shape of your car, you should experience fewer problems with crosswinds in general.
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