I haven't found these listed anywhere online except in this video (starting around 7 minutes into the video).
Auto-complete Google stuff: Ctrl+Space
Auto-complete your own variables: Alt+/
Save: Ctrl+S (as always)
Run selected function: Ctrl+R
View log of run: Ctrl+Enter
(With auto-indent on) indent all code correctly: Tab (just the tab key) (works on selected text)
Comment/uncomment: Ctrl+/