Good idea about Jabba. I too had an idea, though not so radical. Jabba's lines can be rewritten to make them more intimidating, while Han's remain the same, which make him a bit more of a wise guy in the face of a legitimate threat. Moreover, his booming laugh should be added in a couple of spots, most obviously after Han calls him a "wonderful human being." Moreover, I think he should be bigger. He looks to be smaller in SW than in ROTJ, which has always bothered me a bit. There has to be something that could be done about Han walking behind him. With modern CGI technology, I think perhaps he could be made to appear to walk in front instead. Just my two cents to improve the scene.