Cmd + C - copy selected elements
Cmd + X - cut selected elements
Cmd + V - paste elements from clipboard
Cmd + A - select all elements within the same bucket based on the DOM structure
Cmd + click - select multiple elements
Cmd - toggle Block mode (press and release immediately; Toolchain must be on for this to work)
F2 - toggle the Toolchain (on/off)
F4 - toggle Text mode (Toolchain must be on for this to work)
In Block mode, click into non-selectable area to exit Block mode.