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a lot of high-dollar racing groups already do this..... if you ever see their shutdown procedures, they run the engine up for a few seconds, then idle, then shutdown. while the engine speed is raised, they're filling the accumulator and then closing a valve on it to prevent it from running back out when the engine speed(and oil pressure) come down and finally stop.
it works, and it pretty well at that, but considering the average engine already can go 200+(or 300+)K miles without any kind of lubrication failure(assuming the oil and filter are changed when they need it), it seems like an unnecessary expense.
if you had an engine that you knew was weak in this area..... could certainly be useful.
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