No. You can never have rc.local back the way it was. But then, it never really was purely a "local" rc file. To have a real "local" rc file with just your changes in it, copy this file into /etc/init.d/rc.local, and ln it to /etc/rc3.d/S99rc.local. Put your startup stuff in the "start" section.
#!/sbin/sh
# /etc/init.d/rc.local - to be linked into /etc/rc3.d as
# S99rc.local -- a place to hang local startup stuff.
# started after everything else when going multi-user.
# Ian Darwin, Toronto, November, 1992
# As with all system changes, use at own risk!
case "$1" in
'start')
echo "Starting local services...\c"
if [ -f /usr/sbin/mydaemon ]; then
/usr/sbin/mydaemon
fi
echo ""
;;
'stop')
echo "$0: Not stopping any services."
;;
*)
echo "Usage: $0 { start | stop }"
;;
esac