I suggest this on short terms meaning this may be rendered useless however
When a DDoS attack happens on the server One mod has to Spam "Everyone Leave the server" Not being able to do that now with the Anti Spam Plugin allready in the game players will get Accidentaly Banned
Lockdown: Customizable to what groups of players you kick
So if you wanted Everyone Except Builders and Staffmembers kicked when doing /ld enable
Hense making a safe enviorment to Ban the unwanted players.
~Questions appreciated <3
http://dev.bukkit.org/server-mods/lock-down/