When I sold RR replacement kits I used male and female connectors on the sense wire in a Y so the rear brake light switch could be tapped at the orange lead. It was in a good place and nothing had to be spliced, soldered or cut.
If you have low voltage all around the bike as a result of dirty switches buy a can of contact cleaner and perform some maintenance. I've always considered the Coil Relay Mod a band-aid for other problems.
I guess I agree and disagree with this.
EDIT: Wiring the sense wire directly to the battery would work if you rode the bike everyday or so but mine might sit for weeks between rides. I guess you could put a switch on that wire to disconnect it for long term storage.
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