Packing SKUs

Let me describe a scenario I’m sure a lot of ecommerce business’s deal with. During a promotional period you offer some small free thing as incentive for the customer to purchase. This is us every peak season. The issue that we face is how those show up as line items in ShipStation. Now on the one hand it’s good that they show up in scan to verify because it means they are much less likely to be missed during the packing phase. But because our business tends to sell a lot of a few SKUs, having that item show up in the picking module is less than ideal. The single SKU order picking feature would really allow us to streamline our picking process during busy periods but because we have that free item no orders qualify for it. My solution would be some sort of backend flag to a SKU that would designate it as basically a packing material. Then ShipStation would leave SKUs flagged this way off the picking module allowing these orders to be picked as single SKU orders thus saving a lot of time. Then during the packing process these small free items would show up in scan to verify ensuring that all items on the order are included. If anyone has a workaround for this I would love to hear it.