I would imagine Khaled has bigger issues to deal with, such as unicode support (which still needs plenty of holes patched), the scripting features, etc.. Considering DCC works for the most part already, it's not really such a critical feature, but you're right, this shouldn't be too hard given his attention-- and I'm sure he will look at it sometime in the future.
On a sidenote, if you think the implementation would be easy, perhaps writing a DLL for it would be just as easy, until its supported officially. I don't really see much more difficulty in writing it as a DLL. You could potentially even write the implementation and donate the code, as people have done in the past, which might help Khaled get it into mIRC faster.