We want In Stock, Pre-Order, Backorder, etc. to show up in our categories, but NO Out of Stock items to show up. This helps our customer support team save time as they won't have to answer questions for when certain products will be back in stock. Unfortunately, the current behavior in the theme settings is that it displays products if and only if the stock status equals the status in the drop-down, rather than, for example, hide Out of Stock only. This could also be implemented if the Rule Engine product events allowed an action which sets a product as hidden, since the rule engine has a condition which can check for product status.