Hi, This is a great plugin, and I like this very much.
One thing, I would like to ask you is that setting "private" ACL to putObjectStream method in lib.s3.php.
Since the document in the code saids the default is "private", the source code itself set the default as "public-read".
If we could set the ACL value(permission) in config.php, it would be a better idea to set the value to the putObjectSream as well.
I wanted to set the value as private, since I'm using bucket policy, and restrict ACL. Please give a option to set the private. Otherwise I have rewrite the default value.
Thank you for your plugin, anyway! ;)