It would be great for a user of the backend to be able to unlock an account that is locked due to too many invalid login attempts. We're seeing some of our customers and developers run into situations while testing or demoing sites where they get too many invalid attempts to log in with a testing account. They don't want to wait for 10 minutes before being able to log in so being able to immediately unlock the account in the backend would be great.
Here's a thread about it: http://developer.dynamicweb.com/forum.aspx?ThreadID=43819&PID=48