Enabling System Preference Panes requires getting the CFBundleIdentifer for the PrefPane and adding it into the array.
For example, for the FlashPlayer plug-in it will be something like this:
Regarding iCloud, you need to be sure if you added it back in that you entered the exact Bundle Identifier string. You can get that easily at the command line using the following:
defaults read /System/Library/PreferencePanes/iCloudPref.prefPane/Contents/Info CFBundleIdentifier
On my Mac that returns "com.apple.preferences.icloud"
Do the same for any 3rd party Pref Panes, but of course use the correct path (usually /Library/PreferencePanes/)
Once you have the BundleIdentifier you can add that string to the WorkGroup Manager array.