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.