Yeah, those braking "LSD"s are not adequate in a "serious" driving car. Electronic clutch pack diffs can be integrated into the other electronics, so they're a good bet (still reactive, but they're working on the latencies - can't beat physics, though). The "centre diff" of the Haldex system in the Insignias is (tuned to be?) a little tardy, though. Another option is to make the ABS less aggressive, so it doesn't cut in immediately. I meant, though, that ABS and LSDs are both adaptations to manage forces applied through varying tyre grip in "dynamic" situations.