As for making the Viceroy blind, it is an interesting idea, but where are you going to go with it? If it is merely for aesthetic reasons with no in film explaination I am not sure if it will really improve anything. I think this is something many fan films aim for which causes them to ultimately fail.
I think the focus should be on tighening up the story. Kind of dumb I write all of this and yet offer nothing. Like I said I have not seen the film for a while, so I can't give any really good suggestions for changes.
I think the removal of the E-2 (that was his name right?) would be a good place to start. It just didn't fit. We already met Data's brother before in the TV series and it was done much better back then. I think it was pretty lame they found another one of Data's brothers without so much as a mention of Lore. That whole plot line ought to be removed starting with the stupid dune buggy scene.