As title. It would be handy to sell treasure and useless items I have no use for from the loot screen as soon as I get them instead of having to sort through my entire collection later at the store. Before somebody says there are no useless items, Fool's Maul.
I use Fool's Maul. It is one of your only options for getting Simple Bash, certainly for getting such a useful card at level 1. And if you don't believe me that I've had it on an active build, then you'd still be advised to keep it for a drawback-quest build. Having said that, plenty of people have the same request. Search around and you'll see; though right at the moment I'm unsure what the response from the devs was.
I wonder if Green Lotus Root would satisfy as a useless item? Still, Sir Knight's point is a good one - it's easy to overestimate one's ability to separate the wheat from the chaff, and I'd be worried that throwing things out right from the chest would lead to a lot of choices that people would regret.
3, 4 point damage with range 6 cards isn't too bad starting out priest. Also if you have something like resistant hide, just counts as another 2 point heal. Certainly usable.