> Ok, so today I made major changes to the interactive side of the
 > functions(new file attached), mostly because the function would error if
 > you call iti with prefix arg, and the press C-x z, as it would use the
 > last used argument of frame-or-window which is now dead.
 >
 > The problem was that C-x z sends with same arguments, so using code in
 > the (interactive (HERE)) would be repeated, which means same argument
 > would be used in `repeat'.
 >
 > I added subtree speicfic options to the docstring(before they were not
 > there), and made changes to window--transpose.  However it is weird if
 > you C-u M-x transpose-windows C-x z multiple times, you get weired
 > result since the parent window changes, nothing I can do about that,
 > just how windows work.

I now tried to make 'split-window' reuse a dead parent window as well so
you shouldn't have to care about this any more.  Patch attached.

martin