I am now starting to use items from my account to hand in to quests.

There is an option to search shops in when you start a quest.

Maybe we can add another option to check account or to show if you have any in your account on the quest page?

Full support for this! I'd use it all the time. I already account search a large proportion of items needed for quests (anything over 10k 'cause I'm cheap and a hoarder).

I use AS all the time with quests.

I'm really glad its in the hover, but it would be quicker if I didn't have to wait for it to load up. The little symbols, like in wishlists or recycle beast would work well.

It would certainly help me get rid of my hoard just a little faster and more efficiently.

Yes! Or maybe when you shop search for that item, there's a button/option that pops up if that item is in your vault, like there is if it's in one of your shops.