Supermount does'nt work like that. Compile it into the kernel and then modify your /etc/fstab to suit.
Here's my fstab, should give you enough to modify your own.
/dev/hdb1 / reiserfs defaults 1 1
/dev/hdb2 swap swap 0 0
/dev/hdb3 /home reiserfs defaults 1 2
/dev/hda1 /mnt/win_c vfat defaults,umask=000 1 0
floppy /mnt/floppy supermount fs=vfat,dev=/dev/fd0,--,rw,codepage=437,iocharset=iso8859-1 0 0
dvd /mnt/dvd supermount fs=iso9660,dev=/dev/dvd,--,ro,iocharset=iso8859-1 0 0
cdrw /mnt/cdrw supermount fs=iso9660,dev=/dev/cdrw,--,ro,iocharset=iso8859-1 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
proc /proc proc defaults 0 0
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