No mate, looking into it now.
After seeing the thread above for Bootmenu, our I expect will be very similar, so expecting something like (mix of the bootmenus & multiboots for stock kernel:

ITEM_NAME="Maemo 5 Internal Flash"
ITEM_KERNEL=2.6.28-omap1
ITEM_MODULES=mbcache ext2
ITEM_DEVICE=${INT_CARD}p2
ITEM_FSTYPE=ext2
ITEM_FSOPTIONS="noatime" [ -d "/sys/block/${INT_CARD}/${MENU_2_DEVICE}" ] ||

I did notice the bootmenu list FSTYPE as ext2 whilst the multiboot as ext3, not sure myself if correct.