I just love this site.

Anyways, I know it might be catering to the alchemy crowd, but could you possibly add an item/compound option that allows multi-tier checks?

Right now, in order to determine what an item is useful for in terms of secondary usage (I get a 'bad' product) I plug in the same item type into primary, secondary, and tertiary types to find out what's out there. A single checkbox to find all items of a certain type across subtypes would be LOADS of help. I'm sure someone else can corroborate my meaning.