Office Customization Tool missing setting(s)?

chhopkin 

I'm using the Office Customization Tool at config.office.com to attempt to configure Outlook with a list of "Default Internet Calendar subscriptions", but the setting, while present in the list, doesn't seem to include the ability to actually be set to anything (the right fly-out pane has no editable fields), and I can't find any documentation for the XML to add it in manually. Any guidance appreciated.