Ok, here's what I've been doing lately...

I finished going through scene-by-scene in reel 1, picking for each scene the best from three tracks: a light capture, a dark capture, and the "blend" of the two using althor's script. Most of the scenes seemed best either from the dark capture, or the blend. As I reviewed the finished edit, two things bugged me about the blended track:

- a frame that didn't sync correctly in the blend. It took this long before I noticed a single incorrectly aligned frame, so I knew there couldn't be many. But I went on a hunt for more, and managed to find a few others. So now I'm worried about using the blend lest there be others that are noticed later.

- colors. It occurred to me that because of the differing exposures, the white balance in each of the two captures isn't absolutely identical. That isn't a problem when slicing scene-by-scene, however it could make the blended track problematic to color-correct in those scenes where the blend is chosen. Because, the blend is made up of bits of two slightly different color sources, meaning that in some cases there potentially might not be one white balance appropriate for the entire frame.

At this point, I'm inclined now to go back and redo the edit, and only use the blend on a few particular scenes that clearly benefit from it, and only by checking frame-by-frame to ensure there aren't any badly aligned ones.