this is a quiet ...
or maybe the guys who made freelink are answering on another forum ?
Anyway, I have found another hddroofs there http://hikarimail.com/kuro-box.html
(does anyone know it ?), which apparently has kept most of the features of the flash boot (like melodies, fan control, front button detected, etc... all miconapl), all based on etch.
I am not exactly sure how this hddrootfs was built, nor where it comes from but it fits the bill so far (I had to install quite a few apps though, but nothing difficult).
All this until I can get a hold of Yamasita-san's KuroPro/Hack book & CD and check his own hddrootfs, because according to his home page, it will do pretty much all I need it to do, and at least this one comes from an identified source.