That's a great feature but not everyone needs that level of redundancy. If you already have copies of your data locally and are just using S3 as a convenient place to store data that is actively being accessed by services within the AWS infrastructure, RRS may be for you. It provides a much lower level of durability (99.99%) at a significantly lower cost. If that fits the bill for you, the next three code snippets will provide you with the basics you need to start using RRS in boto.
Create a New S3 Key Using the RRS Storage Class
Convert An Existing S3 Key from Standard Storage Class to RRS
Create a Copy of an Existing S3 Key Using RRS