Not only would I love to have what the OP suggested, I'd love to see the following implemented:
  • Let me see the contents of my Retainers' inventories, not just my own, when I harvest -- hmmm do I need more cotton bolls -- how many do I have on hand?
  • Let me spread all the inventory pages out simultaneously, rather than being able to look at just one page at a time -- would make manipulating inventory so much easier
  • Give me a true sort function on inventory pages. And let me filter items by level and/or class (preferably both).
  • Give me dedicated bags -- a fish bag, an ingredients bag, a reagents bag and so forth. I'd be willing to pay for them, so people don't whine about crafters getting something for nothing.
  • Let me craft in the inn where there is no crowding and less lag.
There is a lot to like in XIV but inventory management is not one of those things. Inventory management is abysmal, to be honest.