I'll have my list of things for ROTJ -- but it's brutal. The whole Jabba sequence makes so little sense ("...Let's see, Lando? You sneak in and gets a job as Jabba's guard. No wait, it'll work. Then send the droids in to threaten him and I'll come get caught after Leia gets herself caught while freeing Han. Then we'll all go to the Sarlac pit where Artoo will be in perfect position to throw me my lightsaber. Whattaya mean, how? Why, he'll be hired as a drink server of course! Aren't you paying attention?")
And that's the fun part of the movie!
Anyway, I think the best way to fix the Saga involves changes to ANH-- because it's the one movie that was written without the saga in mind. It plays all on its own, but as "Episode IV" it has a lot of problems.
Have I gone too far?