Brion Vibber wrote:
This tool has not been reviewed for security, and in fact a cursory glance does reveal some potential problems. (Additionally we have general concerns about database impact of renaming users with long edit histories.)
It should not have been turned on at this stage and I'm disabling it for now, so an announcement of availability is probably premature. :)
Fixed and re-enabled. Only users with less than 5000 edits may be renamed.
-- Tim Starling