I used to EOC in an old Metro before it finally bit the dust. The auto tranny was crapped out and you had to shift using the gear shifter. Simply putting it in D would not work. Sometimes it would start off in 2nd gear and do 0 - 60 in about 30 seconds. Anyway, I was hoping I could kill it off for good using EOC... nope. I think EOC is fine in automatic as long as you're not coasting for extreme distances. I would be weary of distances over a mile, but distances less than that not so much. From my understanding, the transmission is not getting vital oil and lubricants during when being flat towed. Unless you're coasting for extremely long distances I doubt you would have enough time to burn up the transmission.
Of course my opinion is untested as well.... just don't come knocking on my door if your tranny bites the dust.
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