A coalition of church leaders, business groups and residents is threatening to withhold support for future tax levies for Cincinnati Public Schools unless the district changes the way it operates. Coalition members held a news conference in Cincinnati yesterday. They want more decision-making authority for the district's superintendent and principals, a new salary system for teachers based on how well they teach and more participation of minority contractors and workers in the district's one (b) billion-dollar construction project. Alton Frailey is superintendent of the 38-thousand-800-student district. He says the coalition raised some very real and important issues and the community needs to discuss what it wants for its children.