I think the question "Can anything else be done to ANH" is a puzzling one. I assume most people on this forum aren't old enough to experience STAR WARS for the first time on the big screen during it's initial run or subsequent re-releases through 1982. Let's be honest. With today's computer technology, it's possible to do anything to ANH. It began production in the middle of the 70s, so there are endless adjustments that could be made in order to "freshen" it up, or modernize it, to bring it closer to the prequal production values.
But...why? Hopefully, just for the fun of it.
STAR WARS is what it is. An amazing piece of entertainment. I was 7 years old in 77, so believe me when I say it literally changed my life...not to mention giving me a tremendous childhood. White sabres can be annoying, but there is a also a certain charm that goes along with grainy film and that original LUCASFILM logo.
Don't get me wrong, what Adywan did was...incredible, and he should be applauded for such a time consuming, creative undertaking. If nothing else, it's a bold statement to Lucas to say this is how you fix a lightsabre...it's really not all that hard to tell the difference between blue and green. If Adywan can make a cinema quality special edition, why can't Lucas fix the blatant errors with his own professional release? I'm all for recompositing fx shots to get rid of matte lines as well as other subtle digital fixes where the original just wasn't good enough. However, if I'm being honest that's where I would draw the line at repairs.
Yes it's fun to hear "Vader's March" in ANH, or find out the limits of a new space battle on home video/computer equipment...but some things should remain the same. When Obi-Wan paused to exchange with a telling smile with Vader befor being cut down, it was that musical cue that brings me back to childhood viewings and embodies the original film. Yes, it was interesting to see how the prequal music fit over the beginning of the scene which wasn't scored...but if the original cue now is substituted or sped up to make room for a prequal cue, to me at least, that's just as bad as Greedo shooting first.
Now I'm not discouraging anyone from using ANH as workparts to see what they can come up with. I think it's great. For some of us though, it's still the original versions we're going to throw up on the video projector when time permits. As an adult and parent, you have less and less time to dedicate to watching movies...so it becomes not a time killer, but an event. The nexst time I invite my cousins over to visit that galaxy far, far away, it will still be the original version...or as close as I can get to it...I may pop in EditDroid's mono mix. Thumbs up to Adywan and everybody's creativeness as we keep the original saga alive for yet another generation, but also try to remember, and make time to experience the charm that the original version still carries.