warn+delete
Send messages to group members and optionally eject or ban them at the same time.
This script is a modified version of Steeev's famous script. My version lets you save messages with a label to make it easier to identify saved messages. It also has less aggressive defaults.
installation
warn+delete works only on Firefox with the greasemonkey extension installed. If you do not have greasemonkey installed, you can get it here. Remember to close all Firefox windows and restart it after installing the extension.
If you have greasemonky installed, simply right-click on the "install warn+delete" link below and select "Install User Script..."