Often I work in a specific grid, adding one item after another, moving back and forth between them.  It occurs to me that it might be convenient to stay in the Item Editor for this kind of work.  But then you'd want the easiest possible way of moving between items.  A forward button would be good to move to the next item down in the grid, and a back button would move to the next item up.  When either button is clicked, any changes made to the item would be saved.  And of course there should be appropriate keyboard shortcuts for forward/back.  Or maybe it is already possible to do this from the Item Editor?