I can't really comment on what is happening at the code-level in the
backend — sorry.
I am a Vim user myself, so I hear your feature request. I doubt it
will happen though, as the product has wide appeal, and Vim/Emacs
key-bindings are not exactly widespread outside small parts of
developer communities. Having said this, a Documents List API-based
Vim save filter would be a cool project, in my opinion, and one I
would certainly use.
Regards
--
Ali Afshar | www.googplus.org/ali | Google Developer Relations