We'll create fresh WordPress site with WP simpleEdit installed. You have 20 minutes to test the plugin after that site we'll be deleted.
After activate this Plugin you can make use of the Tab and Shift + Tab Key(s) in your WordPress Backend in the Html Editor.
It is a nice feature to format Html code with tabulators while writing a Blog Post. Screenshot
Especially if you want to post sample source code in different programming languages.