My proposal is to enable the ID program has more than one group of footnotes, or precisely two groups, with unique numbering each. The first which is being put under the text or at the end of a chapter, the ordinary ones. This as all know for referring or explaining the text.
The second is to be on the outer side margin of a page and out of the text block limits, to mension the diffirences of original manuscripts of the old and complex books, encyclopedias linked captions, or special explaining or commencing, I mean for more specialized use.