Option-Command-Right Arrow Expand
fn-Control-Option-F8 Open VoiceOver Utility
Shift-Command-N File Menu
New Folder
Option-Command-Up Arrow Open
Shift-Command-Delete Finder Menu
Empty Trash
Option-Shift-Command-Delete Finder Menu
Empty Trash
Press enter or space to select a node. You can then use the arrow keys to move the node around. Press delete to remove it and escape to cancel.
Press enter or space to select an edge. You can then press delete to remove it or escape to cancel.