The AWS config file allows for multiple profiles and specifying a particular region if you're in more than one. This allows for having a single configuration file which holds credentials for multiple AWS accounts.

As I've got the [default] entry disabled by default, saws wouldn't function properly. At the moment I've set a particular profile and region as a default just to play around, and it looks pretty nice, but being able to specify profile and region when launching saws would be hugely helpful. (Alternately, if the functionality exists, and I just couldn't figure it out...my apologies.)