Have you actually done this? I tried this urban legend myself while having my T panel off and it's not true. There remains too much twist, vertical is nowhere near enough, it would have to be hyperextended backwards to the balance limit like in Dickey's picture to work.
There are only three or four adjustment options available in the splines that will result in a usable door at, say 75F. You would have droopy doors unless you use very strong pistons sitting in the sun in order to have the bar slide out even past vertical.
For the hell of it I tried many adjustments just to see and it doesn't work. I think Bill Robertson has been spreading this legend.
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