Inventory Tracking Adjusting

I very need an option to track the inventory, but do not stop selling than the quantity is 0.
So, I need to track quantity, but I want the customer to be able to order the item, if the quantity is 0.
Is it possible to adjust it?
Or maybe it is possible to stop tracking, than the quantity becomes 0.
Best regards,

I think you should create custom AvailabilityChecker service.