Richedit is a very general control. Using "richedit" in itself doesn't mean much in itself if the specific features (there are many) of richedit themselves are implemented. It's not as easy as saying "use richedit and mIRC will automatically support images"... there is a lot of scripting functionality that has to be baked in so that you can actually make use of a full Richedit window.
Currently the channel window is a custom control that is *based on* richedit. Anyway, there are plenty of technical details, but the important thing to know is that it's not just a matter of flipping a switch. If K were to add controls to the window, it would be a large undertaking and probably not happen overnight. It would be similar to him *re*implementing dialogs.. and think how basic the dialog support is after all this time.
