With the evergrowing amount of items, mats, dim items, artifacts, gear...

If technically possible, it would be nice to split up auction house..

Create a separate auction house for artifacts and dimension items, make some tabs to divide certain categories into Mathosian, Storm Legion, Nightmare Tide, Prophecy of Ahnket (thinking about mats, artifacts... )
And for item enchantments tabs for runes, speed boost, mounting boost or for runes a level-intended tab.. since runes often have a gear requirement, but this is not always listen in the level colon.