• open msi with Orca (http://msdn.microsoft.com/en-us/library/windows/desktop/aa370557(v=vs.85).aspx) and switch to "CustomAction" Table
• edit "BuildInstallCommand"-Target

/silent /install "[ProductTag]" /installsource enterprisemsi[OptOmahaArgs] /appargs "appguid={8A69D345-D564-463c-AFF1-A69D9E530F96}&installerdata=%7B%22distribution%22%3A%7B%22msi%22%3Atrue%2C%22system_level%22%3Atrue%2C%22verbose_logging%22%3Atrue%7D%7D"

• copy the text after installerdata= to clipboard ( except " )
• open http://meyerweb.com/eric/tools/dencoder/  and paste the text
• click decode
• add your own settings ( master_preferences )
• click encode
• copy the text to clipboard
• paste the text after installerdata= and make sure there is " at the end

You will need to download the business MSI from here:

https://support.google.com/installer/answer/126299?hl=en-GB

They provide a lot of info on switches (/qn is enough) and possible way to customize the app.