i believe it only stays as root as long as the window/program you've opened with kdesu stays open, as soon as you close it i think if you opened it again you'd be required to enter the password again, just like su in a console, close the window or exit the su session you will have to enter the password again to be root again. You can also right click on a file click properties, click on the Application tab, click on Advanced Options button, tick the box "Run as different User", type the user name root and click ok and apply on anything until it closes then when you run that icon or program it will automatically kdesu root that program and ask you to enter in the root password exactly how the opensuseupdater would ask for it each time also.
Regards
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