Place pork in 3 1/2- to 4-quart slow cooker. In small bowl, mix 1 cup of the barbecue sauce, the beer, seasoned salt, garlic-pepper blend and ground mustard. Pour over roast. Cover; cook on High setting 4 to 5 hours or Low setting 8 to 10 hours until pork is very tender. Remove pork from slow cooker, and discard liquid.