Scan barcode to reduce inventory level

We regularly have to process stock, or remove products from the warehouse without an order being processed in Storefeeder.

When we do this we often forget to update inventory levels - meaning they end up inaccurate.

Would be great if we could scan the product barcode and easily reduce the inventory of that product.

Not sure the best way that this would work in reality - maybe click a button to update inventory, then scan in everything being removed and then click to confirm.