That's very clever.  I have just looked at it for Military of the Polish–Lithuanian Commonwealth and Likert scale and it was very interesting.  It is still analysing revisions for List of colours.  Would it be possible to modify it so that the user can specify how many revisions back it goes?  And maybe have a default or recommended value of 400 for that parameter.  That would make the feature reasonably quick... it would also mean that long forgotten edit wars don't get a re-airing... which could be a good or bad thing... depending on your perspective.