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Yuv, If I have "half-a-person" on a picture, I know I don't want that in the final picture. This is easily masked.
If I have a full person on a picture I might want to mark it as: "please include all this", because otherwise enblend might cut of a head or a foot. These are the red and green areas in "ptgui".
What I was suggesting is that we use the alpha mask for both of these cases. 0.5 means: blend allowed, 0.7 means prefer this image, 0.3 means prefer other picture, 1.0 means This image data HAS to be used (i.e. it's an error to have another image with 1.0 alpha mask at that pixel).
I might have a 18mm pano shot from the same location as my 135mm pano. So I'd want to prefer the pixels from the 135mm one over the ones from the 18mm one. If I can arrange the priorities with the order, do I place the low res one first or the high res one?