As of KDE Plasma 5.6 there is the feature indicating task progress in the task manager. This could be implemented for Konversation IRC downloads. What I am unsure about is which download items you would count for 100% download progress. Like if I start 5 downloads of equal size and two of them finish, then I am 20% done, but if there were already 5 finished downloads prior to that I don't want it to be reported as 60% done. If there isn't a way to separate "seen" finished downloads from unfinished ones I guess implementing a feature like this might be hard. Still I imagine it being worth investigating as it would improve integration with KDE Plasma.