In a specific requirement, we need to have out of stock product listed on website for back orders, magento does offer it very well, but I am looking to have a filter for layered navigation, if chosen it should only list products which has got qty >0 , means readily available, if I enable that qty and stock status in layered navigation along with option of show out of stock products enabled, it always list out of stock products too, while I dont want them if that filter is selected. In short I want that even if I keep the configuration to list out of stock products, but when I choose in tock in layered navigation it should show only products having qty more than 0 (not the products enabled for back orderes)