localication problem

How to modify default mount options ?
I need correctly displayed fat partitions, exactly in russian
it can be done with "mount -o iocharset=koi8-r [...]"

but this changes done nothing
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/etc/init.d/knoppix-autoconfig
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case "$f" in vfat|msdos)
if [ -z "$NOSWAP" ] && mount -o iocharset=koi8-r,uid=knoppix,gid=knoppix,ro -t $f $p $d 2>/dev/null;

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/etc/automount.sh
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fat|msdos) options="${rw},iocharset=koi8-r,uid=knoppix,gid=knoppix,umask=000";;
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Regards, Oleg Sannikov