No, there are no registry commands available for the K-lite Codec Pack. I have searched the web, but nothing was available for this process. I do, however, find that you can perform silent installations using the setup package of the codec. There is also a page provided by the developers where you can see the handles you can assign to the setup package. You can install K-Lite with default settings or completely unattended.
To find information about this, use the following URL: http://www.codecguide.com/silentinstall.htm