hi hiro,
these boot codes work for me:
waitusb=5:LABEL=tc
protect
restore=LABEL=tc
tce=LABEL=tc/tce4
i use the same backups with it's configurations on different machines with different fstabs and devices,
but i'm not sure whether filetool.sh could fail in other certain special circumstances.
...i had no problem yet, although i'm a heavy tester and i take every chance to prove my environment on every single machine that gets in my way
give it a try!