I'm just arriving to the forum now, and having recently completed my own fan-edit of BR2049, I was curious to see what others were up to in this respect.
Being more experienced editors, you guys can see a lot of things I never knew were there, and do a lot with editing I haven't even learned about yet! There is such a variety of ideas about what can stay vs. what needs to go, and different people have different things about the movie that they liked or found that bothered them. Makes me wonder if a truly definitive version of this film is really possible? Where there is universal agreement, at least, is in trimming the length!
As for myself, I did go ahead with the Vangelis additions, finding room to insert them at several points in the film, some of these more subtle than others. I also added more of the Zimmer/Wallfisch music to fill in some of the more vacant silences.
In terms of feedback to what you've shown here so far:
(1) I like the inclusion of the Nat King Cole track, but it doesn't seem to quite fit with the Zimmer/Wallfisch music playing at the same time; perhaps adjusting some volumes could fix this, but I do like the 'Rain' track from the original soundtrack as well!
(2) The LUV cut at the archives and idea to cut additional extended silences is okay, but often I don't mind these at all, as it reflects that time and thought was put into what the characters are saying. I find that nowadays many people just say things and don't think about what they want to say first, so I like that the movie hearkens back to slower-paced times and conversations. Of course, what the characters say here is not necessarily deep in every case, but I still like that they're taking the time to think about it!
(3) The color changes you made are fine, but I actually prefer the brighter-orangier colors of the theatrical cut. So this would be more a matter of personal preference, I think (perhaps I'm the odd one out here? :/ )
(4) As mentioned, the part when K raises his arm could just as easily be interpreted as signaling the drone, so I agree this isn't necessarily a movie error, but that's still impressive that you have the ability to alter that scene!
(5) Prologues: these are good as they are, but they are both past events, and I do not believe would fit well in an edit. In part to keep consistent with the original film, there should be no flashbacks or jumps in time. That said, I especially like the "Nowhere to Run" prologue for the same reasons as mentioned that it adds more to Morton's story and also gives us more of the city.
I strongly agree with you about the Rachel scene (I cut the entire thing out in my own edit), and that at least the flashback part needs to go!
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My two cents for now. Hope that comes across more as help (and not as criticism!)