1) The "airbag only works with windows up" concern would be just as much of an issue on a nice spring day at the beach. If you own a car like this and have ever put your windows down while driving on the street, you have already taken the risk so it should be no problem to do the same on the track (where, at least, everyone is pointed in the same direction with a similar mindset and nobody's on a cellphone while piloting an SUV full of screaming kids.)