Originally Posted by Sticky
This feature it's only reserved for RS (renn/race start launch). While not using RS, by pressing the pedal accelerator + brake control at the same time, ETC input will be delayed or disabled. It's a prevention feature, but this can be enabled for left foot braking controlled launch... it's something not much requested by 500/550 biturbo owners thou.
On the other hand, you can do off idle launch without the need of left foot braking + pedal accelerator, and will not have ETC delayed/disable during launch. "