In http://bitbucket.org/chris1610/satchmo/changeset/f9d87d901942/ the dotted module name was removed from the section on tiered shipping. Please add back the reference to
shipping.modules.tiered so users know what they should add to INSTALLED_APPS.
Additionally, the documentation only says 'what' you can do with this module but it does not say 'how'. What is a carrier key? What should be entered here? Documenting the required fields and providing a concrete example would be very helpful.