The following forum message was posted by at http://sourceforge.net/projects/s3tools/forums/forum/618865/topic/4480697:
I have a similar problem to jasbur0; and I don't think, in my case, wonder shaper
will work. My issue is that I have a webserver that once a day uploads files
to S3. It's at rackspace so I have lots of bandwidth; but sometimes the s3cmd
tool will use every last drop of it, causing essentially an outage for a period
of a few minutes for people trying to get to the website.
It would be really nice to specify an option on s3cmd to not use more then x
amount of bandwidth. IF anyone has another solution, please let me know.