With an increase in the number of crafting mechanisms I think it might be a good idea to separate the ingredients area in the AH by crafting type. It could have generic titles like traps (trap parts), low level (new crafting, scarabs, etc.), high level (boots, gs).

The engine may have to change to support things that fit in multiple categories (syberis dragonshards are used for traps and low level).

Just making a request for the nice to have category.