I wonder if it's simply a "legacy" program left in the control modules. On "later" BMWs, like the E9X, DTC has a programming mode to "simulate" a limited slip differential by braking individual rear wheels that's slipping to send power to the wheel that's NOT slipping to promote traction. And instead of completely re-writing the code for M cars that came with an LSD, the same codes were left in the system but coded out not to be accessible, since the DTC coding and functionality is useless with a mechanical LSD.
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Sitting on a beat-up office chair in front of a 5 year old computer in a basement floor, sipping on stale coffee watching a bunch of meaningless numbers scrolling aimlessly on a dimly lit 19” monitor.
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