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The [dspace.dir]/config/config-definition.xml file defines the Apache Commons Configuration settings that DSpace utilizes by default. It is a valid "configuration definition" file as defined by Apache Commons Configuration. See the Configuration File Documentation for more details.
Link to config-definition.xml on Tim's DS-2654 branch: https://github.com/tdonohue/DSpace/blob/DS-2654-common-config/local.cfg.EXAMPLE
You are welcome to customize the config-definition.xml to customize your local configuration scheme as you see fit. Any customizations to this file will require restarting your servlet container (e.g. Tomcat).
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