If you mean IRC Ops and not Channel Ops, it's really rather worthless other than for 'ooh, neato!' factor. To make mIRC detect if a user is an IRC Operator, you have to perform a /who on everyone who joins a channel you are in. In addition, you have to /who $chan when you join a channel... and also have to take into consideration that not all IRC Operators will /oper up until they really need to... so you'll have to perform extra /who commands on timed intervals or compile a database of known Operators by address.
/WHO is an exceedingly resource consuming and wasteful command, especially when used to extract a single byte from the 160-180 byte average lines. If you like several big channels with users over 200 people, you can expect to download a megabyte or more when you simply start mIRC.
I recommend you just forget about the idea. It's cute, but Not Nice.
doin� things a particle can