yes! good idea.
i think the standard HPFS should work via extended attributes for
permissions, group, owner, etc. no special UHPFS would be necessary.
of course, the best thing would be to finally have a standard
non-case-sensitive file system on unix. preservation of case
is important, but being case-sensitive when looking up a file
is a serious time waster.
there was talk when 1.3.x was young about read-write HPFS being
one of the goals of this kernel version; is this still the case?
mark