Hi Tikva!
I´m sorry to hear that you are dissappointed with the plugin.
I would recommend you to use JCE (
www.joomlacontenteditor.com) for an easy way to create html tables, and then give the table an ID (done in the editor).
Then use the plugin as discribed.
However there are no plans of making an admin interface to create tables. This mainly beacuse the easy way tables are created in JCE or other wysiwyg editors, but also because we have not heard of any wishes for such a interface.
Perhaps you can persuade me in making such a interface?
