I would really like the ability to group pages into different "chapters", to signify points at which large shifts in the game occur. This would be especially useful for campaigns where each session or every few sessions covers a particular sub-plot arc. That way, at the end of each arc or session, the GM can combine the relevant pages into a 'chapter'. It would help to maintain control over the growing number of pages that show up in a long-running campaign.
What do the rest of you think?