Mark footnotes containing specific types of data
On an older version of the scriptures web site, there was a setting available that would mark footnotes (with a dot) that contained a specific type of item, based on your choice using checkboxes. The types would be things such as scripture references, topical guide references, bible dictionary, alternate translations, JST, and other notes (IE, OR, etc.). This was a great feature that I used all the time, especially when studying Isaiah or other books in the old testament to see very quickly which footnotes contained alternate translations, JST, or notes. For the gospel library app, you could use a dot to mark the footnote or use a different color for the link text.
When I first got my 1979 edition of the Bible I noticed the footnotes marked as JST. They usually add so much to my understanding of that passage. But there are so many footnotes that I generally just ignored them. So starting in Genesis I went through the whole Bible page by page looking for JST footnotes. When I found one I marked the letter with a red pencil in the text and at the bottom of the page. Anytime I was reading and saw a red footnote I would look at it.
Now I usually read my electronic version of the scriptures and I really miss my red footnotes.