All about the ArtOfTest.Runner you can see in this article
. As you already noticed passing Base URL as a command line parameter is not available in the options. The only option to proceed in your case is to create a custom Test Settings file and specify the Base URL in it. Once you have your Test Settings file you can use it as a parameter in the command line. Please check this article
on how to create your custom Test Settings file.
the Telerik team