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Variable ratio steering is listed in the features on many G60’s I believe. Not sure what that implementation is, but at the simplest mechanical method, the steering rack has differently spaced teeth near the on-center position so it is less sensitive to input and more accurate in that region (more angular input to achieve amount of steering change). More complicated versions like my E60 make the amount of turn you have to input into wheel be speed dependent, so that at low speed, you can go full steering lock in less than one revolution, while at higher speeds it requires the full 1+ revs to turn the wheels fully from center.
I think this is what you are referring to.
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