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Yes - this would be great.

Also, it's unfortunate that the Document Properties dialog isn't
accessible from a macro. I'd love to be able to write macros that
change the tab settings of the current document (hard-vs-soft tabs,
tabs at 4-or-8). I find myself switching frequently since I work with ...

I also prefer the new behavior - especially for the Tool Output window.
(I've written a number of 'tools' which work best with the new docking
behavior.)

But I can see the benefit of an option allowing you to choose between
the new and old modes.

I've actually gotten used to the new behavior - and prefer it for
the Tool Output window.

Perhaps a preference setting could select between the old and new
behaviors.