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As for idle being higher in neutral compared to in drive when no moving. This just makes sense. Granted I don't have the Fords mentioned, but the automatic is not 100% efficient and much less so when not moving and allowing that 'slip' to happen. It's not the idle that's changing, the idle is changed to handle the load when in gear. For instance in neutral you're at 1100, you switch to D and you're at 800 and you can clearly tell there's a load on the engine by the sound. It's probably the same IAC/throttle position in both cases. In P it can drop to the lowest RPM the engine will idle at because it doesn't have to worry about 0MPH in D and stalling.
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