Hear Hear!
mIRC has always been, and always will be a simple text chat program, and this is something that a lot of 'scripters' tend to forget when they create their script systems. While there is a lot you can do with mIRC scripting, it is for the most part, a limited method to enhance mIRC. If 'developers' particularly like the idea of building additional add-ons, why not create your own IRC client?
However, I do think that there are situations where multi-threaded capabilites would come in handy.
