You can only customize the amount of dials, their colors, their spacing and their url, but not their aspect ratio, size, title, background image. The background image of the table are not automatically changed and a configuration box is affixed above the dialers even out of configuration mode. There is no option to exclude scrollbars, or to increase or decrease margins between the dials and the browser border. The imosibility of group tabs bothers, but is within the concept of being a clean addon, which can not be said of the other characteristics.