When performing a silent installation for a Control-M/Agent on Unix/Linux or Windows, is there a possibility to modify the XML file in order to change or add parameters?
For example, the default values for the below two parameters given by the installation are the Agent hostname and *ANY respectively.
LOGICAL_AGENT_NAME
LISTEN_INTERFACE

Can these and others be changed before the install, instead of having to run ctmagcfg after each installation?

The parameters LISTEN_INTERFACE and  LOGICAL_AGENT_NAME cannot be changed during silent installation.

LOGICAL_AGENT_NAME always overwritten to
- COMPUTERNAME environment variable on none cluster Windows
- cluster.Network.DnsName on cluster Windows
- HOSTNAME environment variable on Linux/Unix

LISTEN_INTERFACE overwritten to value *ANY (on Windows and Linux/Unix), and on Windows Cluster machine it'll get assigned the value of network name.

A complete list of all the parameters that can be set in the silent install XML file is attached.

NOTE 1:
The parameter name only is given.  Be sure to use the full syntax in the XML file such as is given above.
For example:  <entry key="PARAMETER NAME FROM ATTACHED FILE" value="YOURVALUE"/>

NOTE 2:

For a local install on a cluster machine the following must be added to the XML:

    <cluster.local.mode>
        <entry value="LOCAL" key="field.Cluster.Mode"/>
    </cluster.local.mode>