Logging failed login attempt passwords was originally included in the development version of Login Security and was removed based on 2 things:
1. Logging incorrect passwords was considered non-essential data that needed to be captured and stored in the DB. ie automated/auto-posting bots will attempt logins with the most commonly used passwords: admin, password, 1234, qwerty, etc.
2. Visually the Login Security Dynamic DB table is already “cramped/crowded” ie the columns are using up all of the horizontal space visually and adding even one more column would cause the visual appearance of the table to be negatively impacted.