Importing a spreadsheet into a blueprint view: ability to map to column headers

An awesome function that's so close to being functional is importing a spreadsheet or another module/view into a blueprint view.  Right now, unless I'm doing something wrong, I can only map things to Line Item, Code, and Parent.  It would be awesome to be able to map everything that's in the Blueprint view column headers and line items.

From this, one can: clear stale data without taking up an entire equivalent size module (BIG win, millions of millions of cells saved)

Copy Modules from other Models, workspaces, etc.

... I'm sure there are lots of other use cases!