At the moment, the /irc nick command only ever changes the IRC nick of the actual bot on IRC. The goal is to open that up to players (config option "allowNickChanges", default off for now) so they can change the name they're shown as in IRC.

Eventually, this might replace the alias command altogether.
Example syntax:
/irc nick game Blay09
/irc nick irc BlayTheNinth-IG
For OPs:
/irc nick [player] [type] [nick]

To make this less abusable, have it check for names known to the server (whitelist, online players) and deny if needed.

Considering I only heard of one person ever using this, I don't think this is coming back.