While the reg appears aimed at JetSkis, etc., many of which already have wrist lanyards tied to ignition keys, the ending regulation could be more sweeping than that. It's proposed to apply to all boats under 26 ft. length, which includes a good many inboard-diesel-auxiliary sailboats.
At any rate, the Coast Guard is looking for your opinion on whether the reg on engine-cutoff switches should be changed.
Go to: Federal Register | Installation and Use of Engine Cut-off Switches on Recreational Vessels
It's a safety issue. Time to participate!