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I didn't read the whole thread, but in case it hasn't been mentioned, many automatic transmissions run the oil pumps off of the input shaft, so if the engine isnt running the transmission isn't getting any lubrication. BMW's are designed this way. Doing this for any period of time with a transmission like that will leave you stranded sooner or later. Another thing to consider is the additional wear induced by shifting in and out of gear. That wont leave you stranded unless your transmission was already on its last legs, but it will cause additional wear and premature failure.
You use so little fuel when coasting anyway, especially with newer cars which cut fuel entirely during engine braking, I doubt you'll see any measurable benefits.
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