Custom genre support? Adding genres?

Browsing Feature Requests today, I thought I remember Billy saying something about adding custom genres in a future build. I remember the post being in late November, but I cannot find it again. Is the feature already available or in an upcoming version? I am particularly interested in being able to filter somehow on country of origin. I would also like to be able to find all films about "film" such as the films Marty Scorcese has made about film, also all of the "The Making of ----" films.

From V3.154 announcement...

Quote :

• Custom genre lists are now available, to enable this feature just create a text file called "genre_filterlist.txt" in your MC settings folder, and just add the filters you desire, eg.
  

  Code:

  <85>
  Action
  Adventure
  Animation
  Biography
  Comedy
  Crime
  Documentary
  Drama
  Family
  Fantasy
  Film-Noir
  History
  Horror
  Music
  Musical
  Mystery
  Romance
  Sci-Fi
  Short
  Sport
  Thriller
  War
  Western

  The filters are not case sensitive, but they must contain the text that the search looks for, eg "fa" would list both "family" & "fantasy"
  The "<85>" refers to the control column width, tooltips are shown when the mouse is over an item so they can be cropped without issue, while there is room to fit 30 filters comfortably with a column width of 85, more can be added, but a scroll bar will be added to the control.
  the following are special tags and are not directly related to the genre, if you want to add these filters then they must be as follows:
  

  Code:

  Top250
  Watched
  Unwatched
  Problem
  Duplicates
  Missing Posters
  Missing Fanart

  Yes, missing posters and fanart has been fully intergrated into the filters.