Not sure with other people's computers, but patch 1.3 fixed it so things don't fall through shelves anymore for me while adding the ability to manipulate grabbed items. It's such a small thing to add to the game & spend time fixing but for people like me who can spend several hours decorating their settlement(s) with the trophies from the wasteland, it's one of the best things Bethesda have done since releasing the game. Will post the results of my obsessive decorating up later...