[css3-multicol] + [css3-text] = vertical writing (almost)

With Firefox 1.5 having at least partial support of [css3-multicol], I
wrote some tests of the effect in relation to the vertical writing of
Japanese, or 'tategaki'. These rules took care of most of the
requirements:

[-moz-]column-width: 1em;
[-moz-]column-gap: 1.5em;
direction: rtl;

as shown at

http://www.sudrien.net/projects/tategaki.html

Justification within a column shouldn't be any trouble in a full
implementation, but
http://www.w3.org/TR/2005/WD-css3-text-20050627/#word-break does not seem
to have any options to break up 'double' kana and foreign words to force
the one-character column width.

Is this even the correct method?
http://www.w3.org/TR/2003/CR-css3-text-20030514/#writing-mode seems to
have no equivelent in the latest draft.

-Sudrien