Is it lack of drivers for the keyboard, or just needing the right coding at this point?
The target archtecture of BD-J is a Blu-ray Player. Blu-ray Player's input device is only a remote controller. On PS3 BD-J, Sixaxis or USB keyboard accepts only remote controller keys mapped virtually.
So when we want a full keyboard for PC emulation, we need to write virtual keyboard code.
In case anyone doesn't know, this is similar to other PS3 BD-J stuff... extract the files and add ROMs to the ROOT of a Flash Drive/USB Drive/Camera/MP3 Player (SD Cards don't seem to work for many users) and go to Videos and Choose "AVCHD" to run it.