I’ve similar problem. Generally I sort products in alphabetical order but no stock items are grouped at the end. So I need in “WooComerce Add-on –> Inventory” manage “Stock status” (“On stock” or “Out of stock”) but it’s not possible by WP All Import plugin. I resolved it by prepare another csv file with no stock items only and manually change “Stock status” but will be great if WP All Import allow set “Stock status”.