So I accidentally bound shift lock to a key and pressed it in game, and can't for the life of me turn it off. I've unbound everything from F12, and then bound shift lock to it (but it sets the key to SHIFT-12 in the options) and I can't seem to toggle it off, using either F12 or SHIFT-12? Now I'm stuck in perma shift lock and its making it hard to handle anything in game, this is a nightmare. Hopefully I can delete the settings file or edit it, to fix it.

You can turn off shift lock by pressing the lock icon in any chest.