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Originally Posted by Glock 32
Automatic transmission have a torque converter instead of a clutch and do not roll backwards (like an automatic BECAUSE THAT IS AN AUTOMATIC).
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It's perfectly feasible to design and program a DCT to not allow the car to roll backward when it is stationary, and also perfectly feasibly to program a traditional automatic with a torque converter to allow roll when the car is stationary as well. These behaviors are not dictated strictly by the type of transmission, although it must be acknowledged that to change them would cost more money for the manufacturers so there's not much incentive to do so. However, BMW does go as far as not allowing the DCT-equipped cars to roll back for a few seconds after the brake is released (they do the same with manuals as well, yes).
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(The other link clearly shows a paddle, but doesn't mean anything anyways and again, Auto's have paddles and I was speaking of the shift knob that looks more like DCT or SMG vs any sort of auto I have seen). There is not even a button on the shift knob to release it from park, etc).
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Yes, prevailing wisdom would indeed suggest that the M5 mules are M-DCT equipped (as has been discussed earlier in this thread). FWIW, it would be possible to design a Steptronic equipped vehicle that did not require a physical "park" button, although as of yet BMW has not done so.