This functionality exists when you hover over the Catch Up navigation item.
We’re working on features that will cover this functionality.
The latest release lays the groundwork for adding start dates. We're working on it. Adding start dates touches almost every corner of Flow and every one of our apps, so while it may seem trivial it's a fair chunk of work. Hang tight.
Hey Brittany, have you had a chance to play with project notes yet? If so, we'd love to hear more about problems you're seeing that project notes don't solve.