I've tried, but had a time getting the drum up to temp quickly with much control and without risking a grease fire. When I've done reverse sears on whole rib roasts or such, I either fire up the kettle for direct grilling and take the meat right off the UDS and put right over coals on the kettle to direct grill for a nice sear OR I've just had the inside oven up to 500 or so and bring the roasts right in and throw em in the oven to finish.
Believe me, I've had the UDS up to CRAZY temps before, unintentionally, but I sure didn't like how it turned out. With that nice coating of "gook" from all these years of cooking on it, I've had a grease fire. Pretty scary.
Big JT's Smokin' BBQ Competition Team
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