LOL. I don't think subject lines are meant to be used to post full questions.
I'm not sure what you mean. Since DreamHost uses Linux, files and directories are owned by a single user and a single group. So any user belonging to the group can read/write given that the owner user has given permission. And with FTP a user is not able to access the files of another user. You can with shell and SSH2 though. You will not have a "super user", again only a single user gets to set permissions on their own files and directories.
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