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How exactly is the tire worn to the point that they've determined excessive and uneven wear?
Was the tire pressure warning the first indication of a problem or were the tires getting excessively loud?
Why didn't you just put air in the tire rather than taking it into BMW? Was there something else indicating a problem?
My guess is the tire got pretty low on the air and during driving (perhaps with some hard corners thrown in), the outside shoulders got toasted and "excessively" and unevenly worn. High wear on the outside shoulder blocks of the front tires is common in these cars, especially if you corner fairly hard or track the car.
If this was the case, I recommend 1) running higher than recommended front tire PSI (I run 37-38psi vs the recommended 33psi) and 2) check the onboard tire monitoring system at least once a week. It will tell you if you're underinflated or possibly have a slow leak. I don't think the tire pressure warning system comes on until 20psi or something like that.
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