Made a remove-pkg script for backing out the TWAIN-SANE packages:
#! /bin/bash
for x in `/usr/bin/lsbom -s /Library/Receipts/$1.pkg/Contents/Archive.bom | /usr/bin/sed -e 's/^.//;1!G;h;$!d'`; do
if test -d $x ; then
fcount=`/bin/ls -a1 $x | wc -l`
lastf=`/bin/ls -a1 $x | /usr/bin/tail -1`
if (( $fcount == 2 )) ; then
rm -rf $x;
elif (( $fcount == 3 )) && test "x$lastf" = "x.DS_Store" ; then
rm -rf $x;
else
echo "Keeping $x"
fi
else
rm -f $x;
fi
done
# rm -rf /Library/Receipts/$1.pkg