I've read a lot of the MR drive-ability issues stem from people putting aftermarket wheels on the car. Apparently PD messed up the code somehow and when aftermarket wheels are installed on cars with staggered offset (most MR cars for example) you end up with 4 front wheels. As we know front wheels are inherently skinnier and will mess up the balance of the car.
I love the way MR cars drive in 6, and haven't had the time to test this wheel upgrade theory, but if the code is fooked, it would make sense.
Let's hope that if it really is screwed up they recognize it and fix it soon!