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The mechanics and engineering aspect of getting something reliable would cost an arm and a leg to buy. Plus, having an extra moving part, inside the nozzle, would wreak havoc in your gun in the event it breaks.
Also, where would you put said valve? The nozzle already sits pretty deep on the cylinder head. Anything inside would be incredibly small and impossible to fix. How would it 'snap' closed? Spring loaded or a total redesign of something that works. What if it jams closed? You'd end up with a back pressure that could possible aide in stripping your piston and gears. How good can a valve be to work fast enough for full auto?
In the end, the amount of air lost is insignificant. IMO, you will lose more air leaking down the feed tube then you would gain.
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