Great idea! This would potentially be a solutions to the issue with Etsy listing being moved to 'inactive' when the last item sells on another platform.

Yes this!!!

"Also, really would love a way to specify a separate quantity that is exposed to sync'd listings vs what we actually have in stock. Bonus points if it's a daily value that will reset itself the next day while there's real stock. No other software I've seen does something like that. Since Etsy and/or Shopify might show inventory quantities really high, it might sometimes give the wrong impression on stock, etc. (Obviously eBay also charges for the full quantity so that's another thing to keep in mind.)"