Where can I find documentation to custom/silent install 3.5 msi?

I use WPKG to deploy in my company Libreoffice. With early versions I can use the transform template to change the language and remove some components, but with the new msi I can´t find any documentation to do the same.

I would like to use parameter in the msi rather than use Orca to modify the file.

Thankxs

http://wpkg.org/LibreOffice

Thanx the wiki has been useful. It was cleaner before, but is still possible to change the languages.