Testrunner.bat output suppression

Does anyone know if it is possible to limit the output of testrunner.bat? I have a test scenario that fails assertions. The output for the failed test is multiple iterations of the request/response messages. I would like the output to be limited to the small summary report that occurs when a test is successful.

In addition, does anybody know how to mask the passwords in the testrunner.bat output?

Many thanks for your help.