Office Customization Tool (Web) for O365-E3 or higher // MigrateArch="TRUE" setting not supported?

So I used the new Office Customization Tool to create an XML file to add to my Intune "Client Apps" deployment.

I was trying to achieve the following:

1.  Replace Old MSI based installs to Click2Run
2.  Upgrade from 32bit to 64bit deployment
3.  Include OneNote 2016 desktop executable
4.  Exclude Groove
5.  Exclude Skype for Business
6.  Exclude Access

However I couldn't find a setting to set MigrateArch="TRUE".

So I setup the config, saved it. Then I downloaded it to local XML file.

I edited the XML to add 

<Add OfficeClientEdition="64" MigrateArch="TRUE" Channel="Monthly" ForceUpgrade="TRUE">

So when I upload that edited file, the MigrateArch setting is thrown away with no warning by config.office.com

I think this is a a bug and a feature request ---

1. Bug - the import of XML shouldn't just report success when settings are discarded .. success with warnings maybe?
2. Feature Request: Please support MigrateArch 
3. Feature Request2: Please document what xml elements are currently supported

Thank you