In the Mapper, if you press the “Select All” button at the top of the input schema window, this will highlight all the fields. You can the drag this to the first line in the mapping box expression field. Then do the same drag and drop operation this time dragging to the target, and it populates the table on that side.
This gives you a rapid 1:1 mapping, which you can then selectively modify.
Is this something like what you are trying to achieve?
