With the recent brute force attempts, I wanted a locking feature for any asshatery that could arise. After enabling this plugin on one of the sites I managed, I managed to thwart the opposition. Although, it may have not been the botnet, it still secured the Super Admin account by locking it.
I was wondering and figured I'd make a suggestion, could User Locker be modified in a way to be used in /wp-content/mu-plugins directory? Think of a multisite setup that needs this across many sites/blogs.