Completely agree that a timer should be added in the timers section.
I've created a request in the UI section on the forums:
http://forum.square-enix.com/ffxiv/t...worn-Map-Timer

Also I don't understand why these maps need to be Unique.
It makes sense that they only want you to decipher one at a time.
But it's just plain annoying to have to run around to retainers or go back to the market to purchase maps one at a time.
ESPECIALLY when you're in a Full group hunting Piesteskins.