Moderation features require a large amount of CPU resources as every word of every message needs to be scanned. On the users machine this may impact the gaming performance, especially in large channels as the amount of messages to be "scanned" increase. As such, this has not yet been implemented.
This is something that is better suited to a hosted solution like nightbot, moobot, ackbot, or xanbot where chat processing is done on remote servers and do not consume local machine resources.
