I want to have a way to run s3cmd to sync between remote buckets. There s3cmd sync, which does local <-> remote, and s3cmd cp, which does remote <-> remote but does not have a sync function.

I'm thinking of adding this functionality since I need to be able to sync up content from one bucket to another as part of my multi-stage deployment process for assets (i.e., staging -> production). But wanted to first see if anyone else had implemented something similar, or might be interested in this feature.