In order to be able to answer this question, I was looking for a way to manage PolicyKit in KDE. Using Google I quickly ran into the KDE's official Authorization manager (mentioned here and here in the official upstream KDE docs):
However, I cannot locate this on my fully fledged Kubuntu 12.04.1 installation. It's not in the System Settings while I have installed the packages
It seems it is supposed to be included in the very base of KDE since 4.3 according to these docs:
PolicyKit is closely integrated with KDE starting from version 4.3. In kdebase-workspace we have an authorization manager and an authentication agent.
In Ubuntu, the package
kdebase-workspace is a transitional package to
kde-workspace, which is in turn a metapackage for some basic KDE workspace applications - not mentioning anything about PolicyKit or authorization, only the System Settings application.
Now, where is this part of the "System Settings" in Ubuntu nowadays?