The ORACLE_HOME and ORACLE_SID are actually preset for the "Installing Oracle 11G" use case found here. But, that being said, nothing is actually broken. The correct paths are set for Delphix to work with the XE and the Oracle 11G use cases. If something is not working in your environment, this should not be the issue. But, if you are working exclusively with XE or just want to change them, go ahead and do it. I will likely change the default values in the next version of Landshark 2.0 to eliminate confusion.