To run TADDM as a root user

you would need to check control script , there is something like:

# Do not allow this to run as root
#
uidNumber=`id |sed -e "s/^uid=//" -e "s/(.*//"`
if [ "$uidNumber" -eq "0" ]
then
show_msg control.E.3
exit 1
fi

comment these lines from conrol file under /etc/collation.properties