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A 128i might be able to get away with coding the e-diff off. The 135i makes too much torque and you will end up spinning the inside tire trying to put power down coming out of corners. I tried it at a track day once and while I wasn't any slower I also wasn't any faster. The car did feel better in some places though while being slower in others (spinning tires).
I would not waste your time making coding changes to things like under-steer thresholds. Those variables are tuned by chassis which have different COG, wheelbase, weight distribution, etc. Just hold the DSC button down for 5 seconds and turn it all off...
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