I think the good thing potentially about long auto is that (im hoping) you can take cuttings.
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Don`t think it will work , even with a longer auto if you were to take a cut early & then place it under a long light regime for vegging the clone itself will still keep it`s auto traits & go to flower ?
I have to agree with MJB on the cuttings from auto's .. i took a cutting from my Big Devil super auto and it rooted but just continued to flower and only grew a half inch or so ...but it was very tiny and cute ...got a joints worth out of her tho so its not all bad.
you could lollypop a hundred of them tho .
I have seen a thread in here from last year where someone told you that you wouldnt get any decent ganja from outside, but it didnt stop you trying. Nor should it, and arent you glad.