I don't think that you can de-tune the engine to the extend that you describe, but it is possible to reprogram the shift points on the transmission, making the car "feel" entirely different ...
Ask for a print-out of the various work orders and make sure it includes all of the "codes". Share on this forum and we'll try to figure it out. Although I'm not certain that the dealer will comply with your request, citing "confidentiality of information", and that the legal owner of the car is BMWFS (lessor) and not you!
Also post this on Bimmerfest.com forum for feedback ...
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PAX5
BMW CCA #20645
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