Just Need to note that is version is gone! You should check the new release!
This is the first WordPress plugin that I’ve released. It’s an attempt to make it easier to add plugins and buttons to the TinyMCE WYSIWYG editor.
It contains several useful plugins from the TinyMCE package that have been slightly modified to be used externally. It should be very easy to install and configure without digging around in the WordPress source code.
WordPress Plugin and Documentation: WP Super Edit