To directly enter a song comment while saving the file. Very practical for a revision comment.
OSX supports it, I think Windows NTFS also supports file comments.
IMHO, such platform-specificity is to be avoided - I guess you’d like to browse songs through the OS file system?
But still, good idea - I’d like it if Renoise could display song comments as we select .xrns files in the disk browser
You know, song comments? 
You can also see file comments on each os in the file open dialogue. Showing the file comment on mouse over a song file within the renoise file browser would be of course favored. So you could see the file comment within and outside Renoise…
The render dialogue also then should have a comment field that is autofilled (if empty) with the comment of the song file.
I suggested this, because at least me have difficulties to:
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Find the right version of song after a period of time.
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Sometimes even revision chronology is messed up if I copied the song to notebook and back, or used some crappy backup system. So I would prefer to name it always with date first, like “2015-04-04 …” etc. to be sure that the file date will be never lost.
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After a year I don’t even remember why I made another version
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I usually use the file open dialogue, since it is much larger and more informative than the r3 disk browser.