Why do you want a battery kill switch?
For theft protection?
There is a couple write ups on starter kill switches, that would have the same outcome. Only negative thing about the starter kill, you my end up with a dead battery but that's better then a stolen rig.
Also a battery kill would alway clear things like your radio memory, clock, and maybe ecu I'm not sure.
Theft protection it depends on were I park it. I won't have to flip it every time