Shortcuts

Open panel: ⌘ ⇧ V (configurable in Preferences → General)
Select item: Enter (pastes automatically if enabled)
Paste without formatting: ⌘ ⇧ or ⌥ ⇧ depending on Preferences
Pin/Unpin: ⌥ P (configurable)
Preferences: ⌘ ,
Quit: ⌘ Q