Classcraft works so well for classroom management that it would be a great help for supply teachers - it gives them additional power and it keeps the classroom routine uninterrupted. Currently, you would have to give all of your account information to a substitute in order for him/her to use it. What if there were a temporary account or sub-account/secondary-sign-in that could be set up? There could be field blanks on the profile page for "secondary log-in" and its "password". They would not have the ability to make any changes (with perhaps the exception of student password reset) but they could use the features to run the class.
Thanks again for a great LMS!