We promised to deliver a feature where you store your proxy cluster config in S3 so you don't have to worry about different configuration in several proxy nodes within the cluster.
Now you transparently store your configuration in your private S3 bucket and you don't have to worry about creation AMIs after every change. You just login as a user you used before and restart the service. Your configuration is back up and running.
We also recommend to perform those changes programmatically so it is all fully automated.