sorry for the delayed reply (but we have been emailing). It might be useful to answer this here. To set the server port - you can use the setPort command when opening the application. This was missing from the Windows CLI post. I have added it, for reference you can do this:
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-- Opening the application and setting the port number ( Windows )
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Command: setPort
Required Parameters: port, Default:8888
Example: SWFRenderer.exe command=setPort port=8889
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-- Opening the application and setting the port number ( OSX )
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Command: setPort
Required Parameters: port, Default:8888
Example: open /path/to/application/SWFRenderer.app --args command=setPort port=8889
Note: This command opens the application and does not use CURL so no comma is needed to separate the parameters.