Being able to search an item name and have it show tasks that require that item is great.
I think having the ability to search and have quests that reward that item also has merit.

Usecase example: Searching for "coins" in packs that reward coins as a form of currency/store.

DJ2's C1 basically first quest, the "Oak Wood (logWood)" quest (Q#848) rewards 3 apples, for example. You can search oak because the base item is Oak Wood (although it accepts logWood tagged items, and you can search logwood just fine, you cannot search "birch" as in birch wood because parsing all tags items to build a search would be expensive); being able to search apple would be nice as well.