There's a forum member whose signature has links to possible ROTJ alterations for (I think) adywan's upcoming cut. It set me thinking: the biggest hurdle in these edits seems to be grappling with what's possible, impractical, or out of the question, all closely linked to budget. Common sense would say it's very much like film-making. Many awesome suggestions can never see the light of day because of cold, hard reality.
If you had the budget, the team, and presumably the storytelling talent, how would you have handled Episode VI? For example: would you have went for Wookiees instead of Ewoks? Would you have presented the Emperor as we know him, or gone a different route? etc.
The products of your wide-open imagination are probably doomed to remain hypothetical. But then again . . . maybe the imagination can be the greatest big screen of all.