* Able to list the same auction several times with 1 click.

Especially true for Runecrafters.
What I mean by this is if you got a stack of 20 runes, you choose that stack and a price, and in the auction house window you can choose to list that rune 1 at a time, 20 times. Or 5 runes, 4 times. Then the game automatically splits the stacks and lists them on the auction house.

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* Search runes according to equipment.

How convenient would it be if you could search for runes that go specifically for the head slot? Or gloves? Or any?
I don't know the names of the runs by heart yet, and I don't imagine many who do, so this will help a lot of players, especially the new ones.