I would like to have resource specific fonts (book-specific user selectable fonts)
The following is a bit like a joke but illustrates what might be useful: Fette Fraktur for the Luther Bibel? https://www.myfonts.com/fonts/linotype/fette-fraktur/
I mean the font is part of the publication (resource), and in the old/ancient resources it would help if it looks old
Also it would be good to select specific Arabic font for the Quran and a different for some other books in Arabic, others may find more examples.
What I know about the Mac and Windows systems, it would be relatively easy to implement resource-specific fonts.