How can I pad the Out of Stock display

Does anyone know if ECC by Webgility allows you to pull a product out of stock if it’s at X quantity? I need to be able to set a pad of 3 or 5 sometimes. So that when the quantity of the items becomes, let’s say 3, it will be out of stock. If not ECC could this be done in the cart’s code? Hate to hack it in but a hook wouldn’t bother me.