You know how in the grimoire there are those ghost fragment stories? What if we could play them as missions? The way I could see it, each time you find a dead ghost you unlock a mission based on the ghost fragment tales. You could access these missions from another Cryptarch in the tower; since they study lost history and all. By completing these stories you get grimoire points, cryptarch reputation, engrams, and perhaps other stuff like secret locations with chests that can only be opened with special items..that can also be obtained through those missions. Anyway, that's my pitch of the day.
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Eh-hem.. [spoiler]BBBBBump.[/spoiler]