Under TOOLS: SCRIPT EDITOR: ALIASES: add the following...

/nomsg { 
  if ( $1 == on ) { enable #msg } 
  if ( $1 == off ) { disable #msg }
}


Under TOOLS: Script EDITOR: REMOTE; File: NEW: add the following...

#msg off
on 1:text:*:?:{
  if (!$window(@Msg $+ $chr(46) $+ $network)) { window -ng2 @Msg $+ $chr(46) $+ $network }
  aline -p @Msg $+ $chr(46) $+ $network $chr(91) $+ $time $+ $chr(93) < $+ $nick $+ > $1-
  msg $nick I'm not accepting private messages at this time. Please try again later.  If you need help, try #afterx-help
  close -m $nick
}
#msg end