Sport mode definitely has to change throttle response. If the car is rated at 400 HP and 450 torque....it feels like 500HP and 550 torque in sport plus. It goes NOW. In comfort mode....it seems hesitant. Seems faster than my M6....seriously (and that is 507HP and 380 torque).
SWB.....you said sport plus does not automatically turn off traction control. Is the traction control warning the light the little orange one in between the tach and engine temp gauges in your pic? If so, mine automatically turns off when I put it in sport plus.