Per-IP interact privilege bans. When you don't want to permanently ban griefers but rather rip their arms off, and have it be enforced for all potentially new accounts under that IP.
/interactban to ban an IP, if the player is online you can specify their username and their IP will be interact-banned right away. To unban an IP, use
/interactunban (does not work with players (yet)).
To bulk-ban a list of IP addresses, put a list of them in
interactban.txt at the world path and use
/ib_bulk to process it.