I apologize if this has already been suggested but..
Even though there's a "Bulk Trade-Ins", I still find it to be tedious work have to sell things, essentially, one by one.
I'm suggesting the ability to click on multiple different items such as clicking on... Lion Skull, Senegal Feather, Giraffe Carcass and many more and it being able to keep them highlighted and sell them all together at once.