bartamos,
I think in this case, from reading his previous posts about faulty ignition switches, I believe he is wanting to use this in a hidden spot as a master power disconnect switch.
An on purpose ground disconnect to prevent any electrical activity unless he turns it on.
Dan
Lot's of ways to install either a "KILL" switch or a "safety" switch. You can disable the hot wire to starter or it's switch or you can shut off the whole huge negative battery cable (like Jimmy "cut the hole too big" Spagnolli did) or anything you desire. All a bunch of wasted time in the whole scheme of things and what goal is in mind. You can use steering wheel locks, hood locks, pedal locks, alarm systems.