Ok, thanks! Added all additional info to the internal bug tracker.
You can use Stakes and Mortar and Pestle to respectively attack zeds (knife stab kind of attack) and to create poulstices for healing.
I've had the game freeze recently - similar to your last report - when using up a bag that I had equipped. Can you remember what you did generally before transferring needle and thread? Did you have a bag equipped in a secondary slot?