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In Gnome 2 there is an applet for panel that forces a hanging application to shut down (to kill the process). User just need to click on the icon of this applet and then click on the application that needs to be shut down. I haven't found anything like that in KDE (on Kubuntu). If there is something like this let me know, please. If not create such widget. I know that there are other ways to kill app but the way it works in Gnome is the most convenient.

Also for unity launcher there is such applet:
http://shuffleos.com/3027/force-quit-ki ... -launcher/
Please, create the same for KDE.

ctrl+alt+esc

there is a brainstorm thread for this https://forum.kde.org/viewtopic.php?f=83&t=89878

in Kmenu search for xkill and then drag it to the panel or desktop

Ok. I voted in the topic you refer to and added a comment.
So, you can treat my idea as duplication.