Well I am not sure how easy it is for jods to just throw a IRC client into his program. I am sure there is quite a bit of work behind, and honestly don't think it is high priority.
I mean he might as well implement something with voice chat at that point.

Also what protocols do you use? A lot of people have issues hosting, well those same people might have issues using a chat client. Most universities block IRC for piracy reasons, so it couldn't be an IRC client unless you found a server that supported different ports than the default ones, and I can't see the point of using mibbit or something inside the OCTGN2 client.
In short, it is a good idea, but I think low priority. There is a lot of work I think that would be required, and deciding on exactly what route to take could be troublesome.