Hey Steelace,
There are a few ways to do what you are asking, such as creating a session variable on the first failed login, and incrementing it by 1 with every failed login attempt. Then, when it reaches a certain number, it does what you want it to do.
If you need further assistance, please contact sales at 888-490-1545 if you're in the USA, or +1-858-768-6600 if you aren't to set up a premere ticket, and our engineers can help you implement the feature.
Thanks