Option to limit cart to one vendor since split cart shipping isn't available
I'm really frustrated by the lack of marketplace shipping functionality in Product Vendors. When a buyer purchases items from multiple vendors in one cart/transaction, the cart/transaction should be split up per vendor. The lack of this functionality for a marketplace website doesn't make sense.
If there are no plans to add this functionality, or until it is added, can you create an option to limit purchases in a cart to one vendor? Maybe through a plugin?