Neat! If I can make one suggestion: I know this is usually not at all what people should with websites, but consider hijacking basic browser hotkeys to augment the shell. Tab for auto complete instead of select next element would be a good start, and I think in this type of situation its acceptable to hijack.
I agree, hijacking is good when it leads to the expected user behaviour. I kept pressing tab to auto-complete the command, but the cursor jumped to the address bar.
There we go, I opened this thread with two things in mind that immediately struck me - tab completion and pressing up for previous command and those two are the top comments!
