Don't know much about anything else, but if you have ever seen the resuts of a lightening strike, that gap at the switch will mean nothing.
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I know it's a hassle, but I think you'd be better off just unplugging your equipment when thunderstorms threaten. Lightning surges have even been known to jump breakers in the off position, much less wall switches. And besides, you'd be introducing another set of contacts and wire terminations in the power wiring which could be counterproductive.