well imo, if this was real life, i wouldnt do it, simply because its such a small advantage, and there is damage involved. even though there is a small advantage in cutting, if you dont do it proprely, then there is consequenses. you would lose more time than you gained, even if you werent cutting. i dont see why people complain about 'cutting', as dave said racing drivers look for any advantage they can get, whether it be mentally, phisically or time wise. when i was driving a small fwd, much like the xfg (suzuki swift), i was hopping most of the kerbs at the chicane, but some kerbs were slower to ride; ones that you took flat out, although if the car had a locked diff it probably would have been faster.. the point im trying to make here, is that its up to the driver whether they wanna take a risk for such a small time improvement - its only in one sector remember - and if its deemed illegal by officials then im sure everyone would stop, but i cant see how such a insignificant 'cut' could be deemed illegal. i think its actually slower the more you put the car off the track anyway because of the way the diff is..