Jumping in to say that per item shipping options are definitely needed! I just subscribed to squarespace commerce and very quickly found out that this wasn't an option. I sell plants and trees, some are shippable and some are not. I may be forced to use squarespace commerce only for online/shippable sales, and using Square POS for all in-person sales, and just not having local pickup options. Which stinks because my online store won't truly reflect everything I have for sale.
I really don't want to have 2 separate inventories/POS systems....