I'm not arguing against the addition of encryption/fish, I'm trying to explain that there are existing, efficient methods of doing this.
Khaled said that this was on his todo list nine months ago so it's probably not coming anytime soon.
"- Does implementing the request involve an unreasonable amount of time, effort, or resources? No."
You would need access to the mIRC source code to be able to say that with any certainty.