Heres my input on some of the above list that I felt strongly about. Mostly my opinions are about story moments, not the technical stuff. I seem to be one who liked ROTJ more than many on this thread.
Tatooine:
- Remove Boba Fett from the film. WHY? He Rules.
- "Cantina"-ize Jabba's speech and expressions. I'm not sure he needs it. It's an amazing puppet.
- Remove Fett flirting with the dancer. I like it. It's practically the only characterization Fett ever gets.
- Remove Han's scene with Chewie in the dungeons. "Everyone gets delusions of grandeur" is on the best lines in the trilogies!
- Cut the Rancor Keeper's mourning. I like it. It's a nice bit.
- Make it so Han deliberately hits or shoots Fett using shots from later in the movie. I hope not. Fett is a minor character with a minor death.
- Attempt to restore the deleted Sandstorm scene and remove the ship-to-ship conversation. Neat, but probably imposssible
Forest Moon of Endor:
- Add 3PO's line "I believe they are called... Ewoks" from the Radio Drama. Might be neat, but seems unnecessary.
- Change Vader's line of "Obi-wan once thought as you do" to "Your mother once thought as you do". This might be a great moment.
- Cut Teebo's Speeder Bike Adventure. Again, I like this. It serves a purpose, and is kinda funny.
Death Star Attack:
- Rebel fighters crashing into the DS shield. This would be sweet.
- Kill Lando, blow up the Falcon. Justify Han's feeling like he's "never going to see her again." What's wrong with a happy ending?
- Remove ring from DS explosion. Please.
Death Star Interior - Luke/Vader Duel:
- Replace the Emperor's advisers with Nemoidians. I thought the Empire didn't like Aliens?
- Edit Vader's dialog to hiding Luke to remove some cheesy lines. Cheesy?! That's some dramatic stuff!
- Add Sith eyes while Luke is beating Vader. Please no. The 'Sith Eyes' thing is just kinda silly in my opinion.
- Add Qui Gon voiceover to Vader's hesitation to imply that Qui Gon passes his secrets of Jedi Ghosthood to Anakin. Vader knew Quigon for like, three days thrty five years earlier. I just don't see it.
- Add flashbacks to Vader's hesitation of Padme, his mother, Qui Gon, etc. Please no. It's cheesy, unneccessary, and against the style of the film.
Ending:
- Add Leia viewing the funeral pyre. Why? To her Vader's the bad man who tortured her. Luke's the one who redeemed him.
- Restore Yub Nub. Yub Nub Rules!
- Restore Sebastian Shaw as Anakin's Force Ghost. Please!
- Attempt to morph Shaw and Christensen into the Anakin Force Ghost. Just too weird.