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Interesting question. The ICV is only open (in pulses) when the throttle plates are closed at idle. The air pulled into the engine when the ICV is open comes from the hose on the fire wall side of the valve. On a stock car, that hose plugs into the bottom of the plenum (so the air has already passed through the air filter). If a supercharger is plumbed the same way, I would guess that the pressure would be the same on both sides of the ICV when the throttle bodies take over and the ICV is closed. In other words, the ICV would not have a reason the leak or release boost. If anything, I would be more concerned with the hose connection with the plenum.
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