I think the way dialogs are done is just fine. And there is a dialog editor in mirc, it's called mIRC Scripts Editor. I don't think any type of 'GUI mIRC Dialog Editor' would be a good addition to mirc itself, things like that are best left seperate.

There already is a decent GUI dialog editor for mirc - DialogStudio

"Allen is having a small problem and needs help adjusting his attitude" - Flutterby