A little experiment Psyke made just proved what was obvious from
the very start. No company would play with proprietary fonts and
let them be added, so someone might blame the company for break-
ing the licenses. I do understand kobo on this issue. If one wants
to have <insert_font_name>, he/she has to do it by the hand. Step
further, if the font is inserted in the container, it is a different mat-
ter. Just months ago that was not existing and some future firmwa-
re could take that into account.
I might be wrong on the topic. To me it is clear that manufacturer
hesitates to implement guest font definition. Never read their opi-
nion on this.