The open source testrunner implementation is not aware that a pro runner exists nor do not know anything about the options available in the pro runner, so it cannot work as you expect.
Regarding to what you explain about your dev environment, you may try this.
I know that the pro testrunner does not require license to run through the command line, so you could install soapui pro using the archive package (ie not a package with a native installer). Then only use this soapui pro instance for launching tests with the command line testrunner.
I don't know if this respect the soapui pro license agreement (see this post for instance:
viewtopic.php?f=1&t=19204)
