I just pushed a first pass at a “Bulk Edit” mode to the ‘persistant-sidebar’ branch. The idea is similar to how multiple selection works in the iOS photos app; You activate bulk edit mode with a button at the top:
This adds a checkbox to all the items in the grid:
It also replaces the single item sidebar (which is used for showing a thumbnail and editable information for a single item) with the selection sidebar. You can then check items in the grid, and they’ll be shown in the selection sidebar with some action links:
Check out the updated branch and let me know what you think.