how to restart a subsystem in alfresco 4 community?

i'm working in installing and configuring Alfresco community edition 4 (alfresco-community-4.0.d-installer-linux-x64.bin) on a 64bit ubuntu server (10.04.4 LTS). I'm trying to authenticate and syncronize users and group with out OpenLDAP server but as long as we make changes to
$TOMCAT_HOME/shared/classes/alfresco/extension/subsystems/Authentication/ldap/ldap1/ldap-authentication.properties
i have to restart tomcat or the whole server.

Is there a way to restart only a single subsytem in alfresco community edition?
Thanks

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