This is definitely a little frustrating. I'd kill for a solution that handles minification, versioning & can upload to S3/etc. You can pass things through boto to get to s3, but the rest requires a bit of fiddling.
I've seen a few solutions that come close, but then they have extremely odd versioning systems. I should just fork something so I can add an ISO8601 timestamp to my CSS & JS; which I like because having granular dates helps when debugging front-end issues.