I'm not sure if it's because they are demo versions (and my experiences echoes esrauch's), but every rich text editor you listed except YUI Editor actually does _not_ map the Tab key to insert a tabstop or spaces.

[1]: http://ckeditor.com/demo [2]: http://www.tinymce.com/tryit/basic.php [3]: http://try.sencha.com/extjs/4.1.1/docs/Ext.form.field.HtmlEd...