Haven't read through this entire thread, so I hope I'm not retreading to much water, but here's my idea for the opening of ROTJ that I posted in the ESB/ROTJ Wishlist thread. I'm no good at posting pics to show exactly what I'm talking about, but I think you can follow...
Opening text would have to be altered to mention that Luke has returned to Dagobah to continue his training.
After opening text, we pan down to Darth Vaders Super Stardestroyer near the uncompleted Death Star.
Cut to Darth Vader in his mediation chamber talking to Luke telepathically through the force urging him to join him on the darkside.
Cut to the deleted scene of Luke in the cave working on his new lightsaber. Edit the exterior of the cave to resemble Dagobah. Luke shakes the voice in his head and continues working and then ignites his saber.
Cut back to the Super Stardestroyer and we see Vader's shuttle leave for the Death Star (why was he leaving from a standard Stardestroyer originally?) continue to the original opening scene with Vader and Jerrod.
After that scene, cut to Yoda's hut on Dagobah for Yoda's death scene. After Luke says "So I am a Jedi.", leave out Yoda's line about having to face Vader again and just cut to him saying "When gone am I, the last of the Jedi will you be." This way we get the idea that Luke has continued and now finished his training with Yoda. Yoda dies, the conversation with Obi-Wan is had, Luke takes off in the X-Wing and then cut to the Emperors arrival on the Death Star. That scene plays out like normal and then cut to the droids on Tattooine and continue from there. This all gives plenty of time between seeing Luke leave Dagobah and his arrival at Jabbas palace.
This would give the beginning of the film a more menacing tone with Vader still haunting Luke and more of a build up to the action at Jabba's palace. Agree? Disagree?