Your question poses a false condition; at least with the Tommy Rose accident. The Venture is not 'short coupled'. My understanding is that the ratio of wing chord to tailplane distance is well within the range of traditional designs. It only *looks* short coupled, because of the relatively high aspect ratio (skinny) wing.
Yes how is the SHORT COUPLED actually defined ?
I think tail volume is defined with chord and moment arm and area based calculation.
So if the elevator length is longer than the moment arm...are we then usually close to "short coupled" ?