Generally when one needs to use policykit, he or she needs to install policykit-gnome. Now we have our own. A new component LXPolkit was added. It’s minimal policykit authentication agent.
Here is a screenshot:
To test it, grab the source code from git.
git clone git://lxde.git.sourceforge.net/gitroot/lxde/lxpolkit
After translations get updated and it has been better tested, there will soon be a tarball release.