Aww, that is a shame, my only option is the Yanfly option then, I believe. @_@To my knowledge, there is not a plugin that does it, and I've been told it would be a difficult thing to do. So, I either use a bunch of spaces and time spent tediously centering it myself or Yanfly's message system and the pixel spacing command, which can still be quite tedious.
For a long game, I wouldn't bother. I wish this were something that could be fixed, because I agree, on a large screen it looks awful shoved to the side.