The keyboard shortcuts are still very much influx. The Escape key used to close the viewer, but then enough other people wanted the Escape key to take them back to the grid view, so I changed it. People really seem to like to use the Escape key and the space bar which causes a lot of usability issues because their functionality gets so overloaded. (Escape is also overloaded to exit from full screen mode, while the space bar both switches from grid mode to the viewer and toggles play/pause on the media controls.)

I doubt I'll ever get a sequence of shortcuts that makes everyone happy. Maybe something like "Command-Period" might work for closing the viewer so long as the embedded PDF viewer doesn't swallow any shortcuts.