I would like to know what linux distros you use on your USB Multipass and how to get them to boot Look below to see what i mean
E.G. "backtrack 4"
title BackTrack 4
root (hd0,0)
kernel /backtrack/bootbt4/vmlinuz vga=0x317 ramdisk_size=6666 root=/dev/ram0 rw quiet
initrd=/backtrack/bootbt4/initrd.gz
boot