If you live in a state that doesn't have any laws regarding using SD in a moving car, then you can add the name of your state + "mode" to the command line, and the testmode will be enabled BUT WITHOUT the annoying warning (it's an undocumented feature of SD).

For example, if you live in Alaska, then just replace -testmode with -Alaskamode, and you'll get all the benefits..

good luck...