vt7 dev release: Related Emails feature missing from Opportunity module

As explained on the developer mailing list, support for relating emails to other modules, like Opportunities and Projects was to be provided in the v7 open source product.

The "Send Email" button is present in the Opportunity but the related list view and icon are not.

And when you add an email from the Opportunity, the "Parent Record" field is not being displayed when you look at the related list of Emails in the original target, e.g. Contact, Organisation etc...

Oddly, the related Email icon is present in a Project but there is no button to send an email from within the Project...?