traction assist could be used for slow moving offroad vehicles, not useful for your case.
you want to activate this assist in a specific case which involves finding whether the vehicle is rotating due to inertia. that sounds difficult since any external force could cause a rotational velocity. you could try activating while rotational velocity and your steering direction are in opposite directions and also you can take understeering(check updateESP function to see how it can be detected) into account. if you are not understeering then this effect may result unwanted wild steers. you can use lateral/longitudinal slip values instead of using car speed, they are calculated from local velocity vectors. finally look out for multiple assists activating at the same time, they can generate forces eliminating each other and/or generate chaotic results.