All the services that start are listed in the /etc/init.d directory. So using their names, issue the following command:
/sbin/e-smith/config setprop status disabled
A simple example would be
/sbin/e-smith/config setprop atalk status disabled
They will never start again.
Watch the screen after a reboot, you should see a disabled against every
service you disabled.
The service-manager is also great, but DOESN'T work properly under E-Smith v5.0