Hi together,
this
is not really a practical request, but an interesting (I think) idea...
ConTeXt
can do simple imposition (arranging pages on sheets, see
\setuparranging), but in professional imposition you need to compensate
for the paper thickness in folds to keep pages readable - you can move
the outer pages of a fold out of the gutter (spine), or move the inner
pages to the spine. (This is called creep in English, Bundversatz in
German.) That means, your outer margin will have different width,
depending on the position of the page in its fold.
See e.g.
https://helpx.adobe.com/indesign/using/printing-booklets.htmlA
guy on the LilyPond mailing list had the interesting idea to adapt the
line width to this creep, to keep an even outer margin - it would mean
that TeX needs to know about imposition while breaking lines.
What
do you think?