This is really a feature request, or a request to integrate my tool in boto.
I wrote a "shell" for running DynamoDB commands using boto. It's available at https://github.com/raff/dynash
It's similar to a "sql" client and can list/create/delete tables and list/add/delete/update records.
If you find it useful please feel free to add it as part of boto. I'll be happy to keep mantaining it and expand the functionalities.