Jnils, the tome starts a timed cataloging quest, currently very popular. Praetorian, that's a lot of dedicated work collecting all the tome paths. I know the players will benefit from it as I've heard folks several times asking in /ooc if anybody has seen the tome.
Having said that, mapping several entire paths with multiple POIs is an awful lot of data for just one quest. It might be almost as useful if you map just the starting POI for each path, and on the tooltip say something like, "Paths northwest along the cavern toward Twark."