The Famous Dave’s barbecue chain revealed last week that it plans to develop a delivery-only format to capitalize on the off-premise sales boom, a popular strategy these days among casual-dining chains. Red Robin, for instance, now has five delivery-only units open, and two concepts in Bloomin’ Brands portfolio, Outback Steakhouse and Carrabba's Italian Grill, are collaborating on eight delivery-and-takeout-only combo units.