Custom inbox layout
In order to make the transition easier from such mailboxes such as Gmail, having options for the mailbox layout would help.
We could have layout options such as "Unread - starred - read" or "Starred - unread - read" to keep what's important to you at a glance.
A well structured inbox makes for better productivity and ease of use, and therefore makes the product more attractive, or at least on par, with its competitors.
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Jason Andersen commented
As a user, I would like to configure sections of my Inbox by selecting an already created label, and then the emails with the attached label will appear in each section of the Inbox. It is a good measure always to have an unread email at the top, but allow the user to configure their sections.