I suspect @jamesj9371 read the idea to mean that items in inventory would count towards your item count, but @simp7fan meant it would count towards your bonus %.
As terrific as it would be, I don't imagine EA would ever implement it because of how it could, and let's face it, would be abused. The only thing remotely constraining donut farming is the inventory limit (says the guy with 3500+ flags)
I'd be happy even with a middle ground, where bonus % items could be grouped together to open up land for design, but still counted all of them towards inventory count. It would free up space without creating infinite inventory of % items.