Also, you can invoke the same command within the run window (alt+f2)
What kdesu does is to run with root (administrator) permissions any command.
Logging as root in kde is disabled by default. invoking kdesu or su from the command line returns the same problem: using the terminal.
The only solution I see to be just point-and-click is to find in the kmenu the "Konqueror, run as root", point the directory where the file you wish to edit is, right click and chose edit/open with kwrite. But still you will have to browse the filesystem, which still is unfriendly.
Unfortunately, there isn't a special section in the control panel for each and every configuration file.
I personally find much easier to open the konsole, su, locate the directory where the file to edit is, and use ee to edit it. ee is very user friendly, like kwrite, and with escape you can easily save or discard changes.