To be honest I'm not sure if I'm understanding you correctly.
If you want to manage the Counter-Strike server via IRC, and maybe mirror the chats too, you should consider using an IRC plugin for AMXX (which I assume you're using as you mentioned plugins).
There's "HLDS <-> IRC
" but also a few more IRC plugins available.
This isn't any related to mIRC or mIRC scripting, though.
But considering this you might also be interested in server queries