Suggest it, and vote on what other merchants have suggested. What the most people want is what gets built.
I find out something is out of stock when a customer orders it and I have to ring them and apologise. A threshold per product and a notification when it is crossed would stop the refunds.
My catalogue is the same shirt in nine colours. Every one of them is typed from scratch today.
I discount by percentage and sometimes go under what I paid. A warning at the point of discount would have saved me twice this year.
When the dollar moves I need to raise 400 prices by 8 percent. Today that is 400 edits.