I've just upgraded my site to the latest 6.x-2.2 release of Wysiwyg, and also took the opportunity to upgrade the ckeditor library from 3.0 to 3.5. I discovered that the "Enable resizing button" option is now ignored, and a resizing button is already present on text areas, regardless of how this option is configured.
I've tracked this down to a chage in the ckeditor library that occured somtime between the 3.0 and 3.5 releases. Previous, it checked this option (in ckeditor/_source/plugins/resize/plugin.js) with the following line of code:
if ( config.resize_enabled )
But now, it uses
if ( config.resize_enabled !== false )
Unfortunately, the Drupal module passes the value of the configuration setting to ckeditor as an integer, and not a boolean, and so this test now always passes, meaning that the resize button is always present.
The attached patch (against 6.x-2.2) fixes this problem by forcing the Drupal module to pass a boolean value to the ckeditor library.