I want to mc a mechanism of macros as far, ready to help testing?

I'm ready.

to collect so
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git clone git://midnight-commander.org/git/mc.git cd mc git checkout-b origin 323_editor_macros/323_editor_macros autogen.sh configure --prefix=$(pwd)/TEST make && make install TEST/bin/mc 

if the macro file ~/.local/share/mc/mc.macros created you can create
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mkdir -p ~/.local/share/mc/ touch ~/.local/share/mc/mc.macros 

to test the operation of external filters can be placed in the section
[editor]
something like
ctrl-W=EditPipeBlock:33;
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it means that the external script file will be searched for in ~/.local/share/mc/mcedit/macros.d/
with the name macros.33.sh
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the content is about
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l Upper case selection TMPFILE=`mktemp ${MC_TMPDIR:-/tmp}/up.XXXXXX` || exit 1 cat %b > $TMPFILE cat $TMPFILE| sed 's/\\(.*\\)/\\U\\1/' >%b rm-f $TMPFILE 

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this filter will translate the highlighted text from the editor to upper case.
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for more information, please see the section about mc.the menu man mc