Is it possible to extend the editor in such a way to add functionality to add captions to table columns in such a way as to ensure that assistive technology will know where the headings are and be able to announce them. For example http://jimthatcher.com/webcourse9.htm
Using the caption element.
So for example, adding inputs to create captions for all table columns or some other way to add captions.
Would also want to turn off features such as adding images in the editor.