My definition of a kill switch is one that shuts the engine off. My Kill/off switch works flawlessly every time. When the buggy is running the rear of the switch (kill side) is raised and all I have to do is slide my shifter hand over and apply pressure by any means I have. I could do it upside down & blindfolded. Where its mounted in relation to me & my hand is critical though & I could see why you wouldnt like it if you didn't factor this in.
I looked & searched for a round button style kill switch, but always ran into issues. Mine had to be the right size, led backlit for night use, ip67 waterproof & dustproof, and available to the avg consumer.