The question of whether adult diploma recipients should walk in a traditional graduation ceremony has divided students, staff members and parents in an emotional tug-of-war. On Tuesday, school board members debated the merits of each side. By the end of the night, the Douglas County School District’s long-standing policy of separating the adult and traditional ceremonies stood unchanged, although board members are free to revisit the issue in the future. “It all comes down to high standards for peak performance,” said board member Sharla Hales. “If we send any other message than you have to learn more and do more, …