I have found a work around for customizing the shape of a rectangle. This will work with using the shape font (dingbat) or imported image but you need to do it and then add it to your project. Start with image/shape.Do all effects.Size the canvas to be just a little larger than the image. Then start to"export" image....this is where you can change the rectangle's dimensions by dragging/pushing corner or by inserting numbers . Finish exporting preferrable .png . Now you will have a custom made rectangle to import and make your logo with. You can chage a circle graphic to an oval the same way.