In Mists of Pandaria, an item called 'Elder Charm of Good Fortune' has been added to the game. The purpose of this item is that once you kill a raid boss or world boss, regardless of difficulty, you will be presented with the opportunity to perform your own personal roll for a chance at additional loot.
If for whatever reason I have use my off spec for a fight, am I able to use these charms to roll for gear for my other (main) spec or are they limited only for the currently activated spec?