separate user logins for each store

At present, the platform can invite another user to have a admin level role to control the whole platform. Please consider the following..
Different levels of roles for the whole platform such as admin, operator with limited access only to add menu items ect. and so forth
different stores to have only (receiving or rejecting) orders user level access as merchants.
As a result one can promote and build a business model to order and pay online for different stores.