Duplicate file names

The plugin is awesome! Except I wish there was a way to force a rename when a file is uploaded with the same file name as an existing file. For example, when you upload “image.jpg” and there is already an “image.jpg” it simply overwrites it. I see that something is adding the date to the end of the file name, would it be possible to also add a “(1)” or something if a file already exists?

http://ww.wp.xz.cn/extend/plugins/simple-dropbox-upload-form/