Have an online spreadsheet view - like the export to excel (also: bulk edit statuses)
Sometimes it's a lot easier to edit things linearly, like in a spreadsheet. For instance, if we've defined what goes into an MVS, then we want to go back and add estimates to those items. If we could have a table view of those cards, we could bop down the list and edit the estimation cells quickly, instead of having to open each card and enter the estimate.
Peter Smoot commented
That would be totally nice. It would also be very handy to add extra columns to the spreadsheet and use that column as an extra field for each card. For example, I want to tag cards by whether they apply to any of three interfaces (GUI, REST, and/or CLI).