I have updated the rhqctl docs[1] with info on the new options that have been added to the install command. There are now options to specify directories for the storage node and the agent to install in non-default locations. And there are another set of options for specifying alternative config files for each service. For example, --server-config can be used to specify a properties file to use and replace the default rhq-server.properties.

[1] https://docs.jboss.org/author/display/RHQ/RHQ+Control+Script


- John