By the way,
You can view a justified EPUB from Feedbooks:
1) By ADE: http://farm4.static.flickr.com/3506/...c6ea91ac_o.png
2) By Lbook firwmare (Cool Reader viewer) running over an Hanlin V3 clone, font set to Arial, size 26, no hyphenation (can be set to on). Lbook does not work well for complex or long ePub files, anyway, just for sample: http://farm4.static.flickr.com/3512/...c970a5b2fd.jpg
3) Using ADE over latest official firmware for Hanlin V3. The ADE support is ugly, very basic, very few options and only four and bad scaled zoom levels, but...
So, yes, I think Sony can do it, definitely.