I wish it was too; I now have both my songbook pdfs marked up in forScore with bookmarks for each song and everything. I'd happily put up a forScore version for people alongside the plain pdf.

Actually if I can figure out how to turn the TOC into links to each song in the regular pdfs, that might be a good thing to do. Surely Adobe Acrobat can do that. I just haven't had time to work it out.