I guess this topic is old but if you have a problem with FiSH or Mircryption you could try Dirt at http://dirtirc.sourceforge.net/
It is very light-weight, does not alter mIRC *AT ALL* and it is very transparent as a Socks4 proxy./firewall -cm4-d on 127.0.0.1 1088
will be enough for configuration.
You can connect to IRC servers as usual and type /dirt
to list commands.