Assuming that you want to run a specific zone for brief periods (less than the default three minute quick run time) and assuming that you are viewing app.rach.io in a browser (rather than a mobile app):
To start the zone, click (or tap, if using a touch screen device) Quick Run, click the zone, click Run. To stop, click the stop button.
So, that’s four clicks for each on/off test. I don’t believe that there is any way to reduce it to two.