Thank you for your suggestion. This is not currently on our road map.
As suggested by others, customers are implementing this pattern using the same container with a partition key per tenant or a synthetic key with the tenant id and one or more other properties.
Will mark this as unplanned and leave open and will revisit this in future planning cycles.
Thank you for your suggestion and votes.Anonymous commented
Yes, this would be great for development as well; I'm on Mac so can't run the docker container for document db.