mIRC should definitly remain an IRC client, and nothing more.
On the other hand, I can understand that a lot of people would like to improve/modify certain behaviour, or add certain features. Instead of demanding these countless variations and wishes of mIRC itself, perhaps it would be more useful to discus extensions to the already present script engine, or perhaps a secondary plugin API to tie in more powerful features for those that need/want it. For example, while we can adjust fonts and colours of most text, and more with fancier theme engines, we're pretty much 'stuck' with the default treebar/toolbar/switchbar icons and styling, so some more customisability could be useful here.
In essence, mIRC should remain an IRC client, but sufficient methods to personalise and augment one's install are always loved.
