in all the footnoted e-books that i have read, the footnote links back to the paragraph it came from. typically, a filepos structure is used e.g. filenote 4 has this coding
what I have messed with though is the footnote superscript styling itself. typically that forces line spacing to expand so a page with several footnote numbers looks unsightly to my eyes.
i.e. the lines with footnotes are spaced wider than other lines. ( in ADE/ sony readers anyway)
So I have altered the footnote numbers from superscripts to regular ( but small font ) numbers to overcome this.
in paper books, this does not seem to be an issue, but in e-books it is often ugly