CHATTANOOGA -- Betty Moorer stands out from the other employees selling burgers and fries at a Krystal restaurant. For one thing, she's the only one wearing a gold shirt. She's the only one with a name tag identifying her as a "master cashier." And she's also the only one getting paid extra for being friendly and courteous to customers. Moorer, who has worked at Krystal in south Chattanooga for three years, is the first employee in the 425-restaurant chain to achieve the special designation as part of a program to combat complaints of indifferent and surly fast-food service. "A smile...