Anyway to move multiple items at once to your backpack?
All these keys and books
Not too sure, but I don't think so. Not en masse anyway. I never tried though, I just let the items sit there.
The inventory in this game is really
I think anytime you use a key once it should disappear. It's not like you need it again after that. Books too. They should go into a sub-menu after you read them. "The Witcher 3" had an equally bizarre inventory system but they fixed it in patches. A little message would pop up if you read a book, so you could toss it or move it.
Fred.