I'm hoping that some ROTJ footage of Leia, Han and the Rebels fighting their way through to the bunker control room exists (it would appear to have been filmed).

In fact the extra footage I would like to see more of it ROTJ because the final product is such a let down.

I would like to see Luke's saber practice on Dagobah but as that film is so good already extending it doesn't seem important.

I would only want to extend the range of ROTJ footage with an eye to cutting some of worse footage but coming out of the process with a movie of about the same length of the other Star Wars movies.