Mass-Edit Imported Expenses

When I import expenses from a spreadsheet it's tedious to have to edit them one by one to add them to the correct group and set the correct split. It would be nice if there was a mass-edit feature (either applying to all expenses in the import, or a selected sub-set).

Alternately, if the spreadsheet import could support additional columns and syntax for denoting the split type, split amounts/percentage/shares, and group name, then I could just pre-format that all in my sheet and import it in one fell swoop.