Editing edgetransport.exe.config. Error in documentation?

Hi, according to http://technet.microsoft.com/en-us/library/ee681659%28v=exchg.141%29.aspx, "You can add new configuration options".

I tried this with a simple <testoption></testoption> in the configuration section and the transport service failed to restart. So, how does one go about adding a new configuration option?