The problem with that layout is, imagine you are a common calibre users who has 0, 1 or 2 custom columns, that would mean all the space on the right is wasted and you have to unnecessarily switch tabs to edit the cover/comments/formats.
The default layout of that dialog will always make it most convenient to edit the basic metadata. I may consider making the layout dynamic to accommodate people with small screens/lots of custom columns, but that's going to be rather a lot of work.
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