As an avid TinyMCE user and plugin developer, I found very this useful.
It actually is very basic stuff and nice to be able to extend some features, or disable some!

Note: Maybe fix the URL’s in the admin? People who do not use this would get lost, easily.

Change:
http://www.tinymce.com/wiki.php/Configuration:block_formats
to
https://www.tinymce.com/docs/configure/content-formatting/#block_formats

Thanks!