The OP gives me the impression that we'd be better served by an ammo revamp while we're at it.
Quote Originally Posted by Edyth View Post
Stacks of unusable bombs, when applicable
Stacks of equippable rocks/feathers/needles/etc., when applicable
These two should not even be on the list, as they should have been removed when ammo with stats was changed. Give everyone 60-day notice that you're gonna remove that category from the AH and make the change.
Pumps
Stacks of pumps
Fans
Stacks of fans
Batteries
Stacks of batteries
These are in dire need of simplification, as to my knowledge the weapons these are tied to aren't exactly useful nor are they really common. Considering the most popular of these drop in Sea and use Virtue Stones...

As for the topic, I agree that there needs to be an additional category or two to fit all this ammo and reduce the clutter in the AH.