mkvToolnix is a unix set of tools for manipulating mkv files. It uses wxWidgets to draw its GUIs. I would really liked to see KDE's native GUI for mkvToolnix.
The screenshot is only gtk GUI (wxWidgets). I think it can't be so hard to program a GUI like this, can it be?
If you like this idea, please vote. I hope a skilled programmer will see this. :)