Default "My Posts" filter for customers in public portal

I want to be able to enable a default filter for customers in the public portal that shows them only their own posts by default, but allows them to "open up" the rest of the posts if they want. Currently, the Author filter is only available for admins, and customers have to go to their profile to see their own posts. Having a "My Posts" filter or a default view setting would make it easier for customers to track their own feedback while still being able to browse the rest of the board.