yeah, I am not a fan of that on the spine at all. I think you can make a new spine logo that has the word extended in it without much difficulty.
Basically use the same methods as for the front logo, except this time start from scratch. Try the 'Star Jedi' font, or something similar. I have found that particular font to be the closest to the Star Wars style. The fonts 'A New Hope' and 'Lucas Font' tend to look like crap, imo. If you want help with this. let me know, I can also probably throw one together for you to use real quick tonight