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Most cars that say they can't be flat towed usually also have a mileage limit i.e.: don't flat tow more than 50miles before running the car again. It's because the engine needs to run to turn the fluid pump in the trans; without turning the pump the moving parts can run dry and start to wear extremely fast. Being in a running car and shutting off for a 1mile down hill SHOULDN'T cause any extra wear on the internals of the trans since they are only running without active fluid pumping for a short time/distance. Some autos are safe to flat tow (Saturn S-series) and it is not recommended for some manuals (Subaru WRX (according to a friend of mine)).
Disclaimer: I am not responsible for any damage done to any transmission anywhere in the world lol.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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