Disabling updates on OS X using /L/P/com.adobe..plist

Having read in the Acrobat Deployment Guide that as of Acrobat 10.1.1, there's support for placing a FeatureLockdown-like key in a plist in /Library/Preferences. This is detailed on page 142-143:

http://helpx.adobe.com/content/dam/kb/en/837/cpsid_83709/attachments/Acrobat_Enterprise_Ad ministration.pdf

I'm specifically concentrating on Acrobat Pro X (10.1.1) in this case, and am testing on Snow Leopard 10.6.8. I've placed a plist at that path:

sh-3.2# defaults read /Library/Preferences/com.adobe.Acrobat.Pro      

{

    10 =     {

        FeatureLockdown =         {

            bUpdater = 0;

        };

    };

}

Or, if you want the full XML plist contents:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

    <key>10</key>

    <dict>

        <key>FeatureLockdown</key>

        <dict>

                  <key>bUpdater</key>

                  <false/>

        </dict>

    </dict>

</dict>

</plist>

It doesn't seem to take effect. I've tried restarting, logging in and out the user, convert to and from XML to binary plist format, nothing. I notice that Acrobat Pro X's updater plugin also knows something about a plist at /etc/defaults/AdobeARMOverrides.plist. Is this of any use?

Also, the proposed workaround at 15.6.3 is wrong:

"15.6.3  Preventing any updates

To disable the application’s ability to update altogether, use a post install script to move, rename, or

delete the Updater.acroplugin file from the <root>/Contents/Plug-ins/Updater.acropluginplug_ins

directory."

This should read "<root>/Contents/Built-in/Updater.acroplugin". I'm quite able to resort to this method instead, but I'd rather use the plist method so I don't need to remove the Updater with every minor update.