I am also wanting this feature. I want to have a free shipping for orders over a certain amount to encourage customers to buy more items in a single order but I have heavy items that would qualify on their own that I want to exclude since the shipping on those would wipe out any profit.
I do not have the sales volume yet that justifies paying for a third party app.
This along with assigning shipping profiles to individual items to get accurate rates for customers should be native!
I have small items and heavy items. I