Preorder, Back In Stock ‑ STOQ

so far this app is great. I am only using this one over the other options because they are reasonably priced. I love that they have a feature where I can see what items customers are waiting for so I can prioritize ordering items that people are waiting on. This app would be even better if it also worked when there is say 3 in stock of an item but the customer attempts to add 4 or more to their cart.