I don't know if this has been suggested before or not, but when adding items to the Armory (I'm having to resist spelling that with a U as we do in the UK), there's no indicator of whether you already have that item in there or not, so you have to use Account Search to find out. I don't want doubles of anything that isn't single use (speaking of which, there are a few items that say they're one use when they're really once per battle, such as the Earth Ninja Star), so I would find it really helpful if, like for the option to add to the Minion Zoo, it says "You have (x) there already" so you don't have to spend time loading pages to do an account search, or looking up the item on Subetalodge to see if it's on your checklist.