Custom Table Styles

Tables added through the WYSIWYG editor have default styles, including table and cell borders. Because these styles are added inline, they overwrite any theme styles set in the CSS. Perhaps there needs to be an option to add an unstyled table, which would allow the theme CSS to do its job. Or better yet, allow users to create custom styles that would match their theme, even enabling a default custom style to be applied to all new tables.