Hi,
I woulds like to create different page variations for returning visitors. That way you can try a different type of messaging, or offer a discount to those visitors who bounced the first time, without having to set up dedicated remarketing campaigns. This could be especially useful for search campaigns, where many different keywords can lead to your page, and visitors who initially bounced will often return to your page after using a different search query.
You are already differentiating between visits and unique visitors in the reportzing section, so I image it would be fearly easy to implement this feature 🙂