That would be bad for mIRC to do. DCX is updated frequently (much more often than mIRC). If mIRC included it, you'd almost always have an outdated DCX in mIRC and that wouldn't be good. It also means that if the authors of DCX stopped keeping it up to date, Khaled would have to take over or else drop all of the DCX features from mIRC. Neither would be a good thing. Including everything from DCX in mIRC natively would be fine, but including DCX itself wouldn't be good.
