There is not. This is an issue of software vs image, and how complex I wanted the table image stuff to be. It certainly *could* be modified to allow for things like this, but on the other hand, since you know where the names are going to be, you can modify the image and place borders directly in the image.
Seat numbers were another issue like this. I initially wasn't going to include a feature for displaying seat numbers, since they could be placed on the image as well. But I realized that some people may want seat 1 to be at a different seat, and it would be a big hassle to change the image for this. It would be more convenient to include options in the XML.
Borders around names, I feel, aren't as important. You know where the names will go, it's a one-time thing for you to add the borders to an image. That vs. adding more options that will potentially confuse other users.