First, you need someone who's willing enough to redo prequels. Then that person must get his/her story straight and make up a list of scenes and shots that he/she has problems with and let the fans start coming up with alternatives and scene suggestions.
Cause sitting around and just making scenes up without any sort of direction is basically what we already have - The Prequel Radical Redux Thread.
It may have 240+ pages of posts that a lot of people think no one will ever read, but if someone truly decided to fix Prequels - that someone wouldn't have a problem reading through all of them.
So, there's no need to make more threads and scatter our ideas.
Just my opinion.