OP10 Multiple Media Picker is a great extension to the normal Media Picker
With this plugin you are allowed to change the media name within the content section.
For SEO ranking you can also edit the Physical Name to change the media name on the server.
If you want to use less clicks you can also enable the quick-view property which allows you to edit the data directly in the overview and not in the dialog.
The plugin supports also the Image Cropper!