Ohh, sorry, I'm refering to 5.5...
In a nut shell, create a custom template in /etc/e-smith/templates-custom/etc/proftpd.conf called 05AllowOverwrite.
In 05AllowOverwrite add these lines:
AllowOverwrite on
AllowStoreRestart on
Save and expand proftpd.conf and then restart xinetd. That should do it (working from memory here so if I missed something please excuse me).
Terry