Programs used by BackupMenu:
/usr/bin/text2screen
expr
cat
/usr/sbin/evkey
modprobe
ifconfig
dd
cksum
echo
insmod
/lib/modules/current/phonet.ko
/lib/modules/current/g_nokia.ko
mount
mkdir
/sbin/udevd
/sbin/udevadm
hwclock
awk
getty
umount
fsck
sleep
chmod
/usr/sbin/sshd (for SSH server - optional)
date
find
sync
reboot
poweroff

Thats the full list of programs called. I have a feeling that 90% of them are part of the BusyBox executable; copying that and a bunch of symlinks will take care of those.
Anything that has a full path in my app has it here; everything else shouldn't matter so long as it is in the $PATH.


Edit:
Tan, you are correct in your last post. You need to flash your rootFS image -as- a rootFS image, not a fiasco image.