To my knowledge, the P-47 has a two STAGE turbosupercharger, not a two SPEED supercharger. The turbocharger part of the deal has a widget that automatically maintains ground level manifold pressure up to over 20,000 feet (~6000m). While pilots may have had the means to mess with turbo governing in flight, it's not modelled and would work differently to the two speed arrangement anyway.

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Tully