While posting on a topic about the Thu'um, i got the idea for a mod that implements "Slen Tiid Vo" (Flesh Time Undo) as an actual Dragon Shout that the player can learn, upon the death of Alduin. What this shout does, is it acts like a Reanimate spell in a cone shape, similar to Unrelenting Force's shape. The first word of the Shout will reanimate weak dead creatures. The second word of the Shout will reanimate moderately powerful dead creatures. The third word of the Shout will reanimate ANY dead creature, but requires the use of a Dragon Soul to reanimate Grand Soul level creatures, thus giving a use to Dragon Souls once you've already maxxed out all the other Dragon Shouts. Reanimated creatures will last between 180-300 seconds before they collapse into a pile of ash.
I personally don't have the time to create the mod right now, but am wondering if anyone else wants to pick this up and make it?