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There are a few OEM 6-cyl diesels that run the engine on half the cylinders at idle to facilitate quicker warmup. They switch between the front three and the rear three cylinders every few seconds. Older Cummins ISBs and Detroit 60-series are examples.
DOD gasoline engines must disable the valvetrain when "misfiring" to maintain an exhaust composition of a stoichiometric air/fuel ratio or the extra air pumping through renders the cat and O2 sensor useless. That's what I would be worried about if attempting to concoct some sort of pikey DOD system.
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