Hey Robinin Texas,
Thank you for your message.
I looked at that option. The only problem is that I run a membership site and often legitimate mistakes are made be members entering their username incorrectly. It would cause even more issues if these guys had their IP permanently blocked when this happens.
For this reason, it would be great is Wordfence enabled a feature whereby we could nominate the specific common hack usernames such as "admin" to permanently block.
Cheers,
Anthony