> I'd some application where on all left-hand pages (in one chapter) text
> were typeset with 'footnote marks' and on the right-hand page ***all***
> corresponding 'footnotes' from the left pages were typeset.
you mean like ftnright but across a spread? or differently?
> Maybe you can include endnote style(s) then there's no need for an extra
yes certainly, endnotes is one of the variants that will eventually come
> BTW does there exist an option that, e.g., suppresses a float in column
suppress generally, yes simply by specifying a float style that has no areas
in column 2 and of course by varying float styles (even from page to page) you
can vary the behavior as well, e.g. no floats in column two on odd pages ...
as to the equivalent to \supressfloats i.e. specifying modifications through
directives within the document that isn't implemented at the moment, but there
is no general obstacle doing that and something along those lines will
eventually be possible and in fact will be even more granular than it is at
the moment with 2e, e.g., you could for example specify
which would then prohibit top floats in column one and top floats spanning
column 1 and 2 but still allowing top floats in column 2 only (and 3 and 2-3
in a three column layout).
syntax would need some thoughts, e.g. \suppressfloats could supress everything
and \suppressfloats[t] all topfloats and specifying the areas explicitly
would then be the most granular possibility