you are right, better to put: How to make Image Dialog and Link Dialog more simple.
To make the CKEditor more simple (i.e. remove unnecessary buttons) you need to change \qa-plugin\wysiwyg-editor\qa-wysiwyg-editor.php from line 136. This is how I did it:
$qa_content['script_lines'][]=array(
"qa_wysiwyg_editor_config={toolbar:[".
"['Bold','Italic','Underline','Strike'],".
// removed Font + FontSize
//"['Font','FontSize'],".
"['TextColor','BGColor'],".
"['Link','Unlink'],".
// changed position
"['RemoveFormat', 'Maximize'],".
"'/',".
"['JustifyLeft','JustifyCenter','JustifyRight','JustifyBlock'],".
"['NumberedList','BulletedList','-','Blockquote'],".
// "['Image','Flash','Table','HorizontalRule','Smiley','SpecialChar']".
//"['Image','Flash','Table','Smiley','SpecialChar'],".
"['Table','Smiley'],".
"['SpecialChar']".
"]".
hope that helps.