Board Sharing is now live. You can now share your board with up to 10 other users. You have to enter their Autodarts user name correctly, there is no auto completion. You can do so from the My Boards page. Users you shared your board with can use it normally as if it was their own board. They cannot rename, delete, or re-generate the credentials for it.
For those of you that I set up board sharing for. All the users that I set up for you are actual owners of the board. If you want to change that, remove them from “Shared with” and add them again, then they are users of the board, not owners.