WORKAROUND
Currently, you can customize the WCF port that the coordinator uses to communicate with the agents using a new agent configuration in combination with using the powershell modules to customize the configuration settings.
Below is an example of powershell commands that would connected to the "Default" installation and create a new agent configuration named "AzureConfig" that has the Agent Servcie port set to "12345":
Product Backlog Item 240791: As a CA Administrator, I would like the Agent Service Port (8373) to be configurable in the Change Auditor Client