Does it do anything different? like shut off all electrics in a proper fashion etc.
I mean something other then on and off, like what the Key does
I often wondered why the ST has a kill switch as it has a bank angle sensor which does what I think the kill switch was originally meant for.
http://motorcycleviews.com/general/seventhings_2.htmA Bike Has a KILL Switch
Cars don't have KILL switches. The closest you can come is to turn off the ignition. On a motorcycle, a KILL switch has several purposes.
The motorcycle KILL (or STOP) switch is in series with the ignition switch. When the KILL switch is open, the motorcycle will not start.
Most motorcycle training courses suggest that you get in the habit of using the motorcycle KILL switch to shut off your bike. The reasoning is that if you don't use it, it won't work when you need to use it.
Much confusion occurs in traffic when you inadvertently trip the KILL switch and then can't figure out why the bike won't restart. Always look at the KILL switch first.
You may need to use the KILL switch
if your bike falls over and you can't reach the ignition. Just trip the KILL switch. KILL switches are also known as RUN or STOP switches.