Don't shoot on totally dark room, phones have different kind of flashes. So your question is not about improving the camera, but improving the flash timings in totally dark room.

And shooting on totally dark room is a usecase that is not common and that's why there is no stupid optimisations for that. I would start to worry if pics would look too good in totally dark room, since then pics would look crappy on with normal lighting.

N9 makes best pics outdoor with decent light. And if you need to use flash then your doing it wrong