Single Product, Multiple Variants...Help Plz!

I am interested in this as well. As an example, I sell mini note cards. I want to offer customers the option to buy the cards with envelopes or without envelopes. I want to have one set quantity regardless of whether or not they want envelopes, because the quantity is based on how many note cards I have, not the variations. Let’s say I have the ability to make 10 note cards sets, I can make them all with envelopes, all without, or some combo of the two. But if I put 10 for each of the two variants, it shows that I have 20 total available rather than 10. This functionality seems really basic, and clearly people have been asking for it for years. I sell on Etsy and they do this with no problems. Are there any plans to fix this?