A 2 speed gearbox with the change up/down button as the 3rd channel or an adjustable wing partially mixed in with the throttle.
I cant think of any real examples that would give you a competitive advantage, without a track change the 2 speed gearbox wouldnt give you an advantage and im unsure if the extra weight of the adjustable wing would be outweighed by the extra speed gained (if any?).
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