The autocompleter is not intended to intercept any keys except the bare minimum required to choose a value or dismiss the pop-up. Having it intercept number keys means you won't be able to type any numbers present in the pop-up into the editor until you dismiss it first; otherwise you would insert an undesired item from the pop-up.
Numbered selection works fine for e.g. IME text composition where there is a clear separation between input and composition phases. That is not the case here, so I don't see an acceptable way of implementing your request.
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Do you mean a number that would appear in the auto-completer popup?
Didier
Yes, sure.
Last edit: Víctor 2015-11-02
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With [#1200] you can navigate without using the arrow keys.
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Feature Requests:
#1200