Added in 1.8.4
/quote [-nq] <command>
Sends the specified command directly to the server. You must know the correct raw format of the command you are sending.
Same as /raw.
-n - Prevents characters in the range 0-255 from being UTF-8 encoded, as long as the line contains characters only in the range 0-255.
-q - Makes the command work quietly without printing what it is sending.
<command> - The command to send to the server.
;Send a raw PRIVMSG to the server. /quote PRIVMSG #channel :Hi testing rawdata.