I think the issue is with the ride height sensors. You should change the pressure based sensors to physical height sensors.
The ECU is detecting a catastrophic suspension failure and is trying to save you from a crash.
Yes. Ordered the BMW knob and adapter. Boot retainers work depending on the shape of the knob. If the knob has a wide opening at the bottom (designed for reverse lockouts), it will not lock the boot retainer in place and it will rattle. So I am not using the boot retainer with this knob.
It allows you to choose Normal throttle mapping for Sport and Sport+ modes. Feels a lot more linear and less jumpy on initial throttle in.
Slides are a lot easier to control.
When fuel quality is the limiting factor, you should use a lower octane map. That would give you the optimum and cleanest operation.
You post is quite self contradictory.