For some people like me, the file manager is the simplest way to find, open and edit files. KDE 4 distros normally use Dolphin for that.
However, Dolphin does not come with Root access (normally). What can then users do to open the file manager with super user privileges?
1. Pressing Alt+F2 to open the application executing prompt. Then, you type "kdesu dolphin". It will ask you for your root password and then you can ravage your system at your heart's will.
2. Opening a terminal as super user to start Dolphin from it. Then you can storm the gates of your files.
3. Opening Kmenu Editor (Kmenuedit) and then, you add a new entry in the "System" category (or the one you prefer). You will need to add this information to the new entry:
Name: Dolphin as Root
Command: kdesu dolphin %i -caption "%c" %u
Don't forget to assign a distinctive icon to it. Something red or with a skull might work! :P