If you press and hold on a song in your library, there is an option for PDF based songs to Swap the PDF. This allows you just to select a new PDF on your tablet, and it updates the pages for the song. Not sure if this helps at all, or if more is needed to make this useful...
I'll definitely keep the idea of a synchronized folder in mind, especially if a lot of users would benefit from this.
I'll definitely keep the idea of a synchronized folder in mind, especially if a lot of users would benefit from this.