Sauce is something that some folks put on with out thinking others have to have that 'special sauce' to make it right.
In my BBQ catering business I prefer NOT to cook using sauce. By rubbing the ribs down with the dry rub and marinading them over night, they are plenty moist cooking them indrect.
One thing that I do like to do, is fill a spray bottle with apple cider and mist the ribs after the first hour or 2 of cooking and every hour after that and again just as I take them off. I have used other things such as orange juice, pinapple juice and others but the apple cider is my favorite. It does not burn and leaves the ribs nice and shinny and imparts a kind of sweetness to them. I also use this on the pork butts.[p]Marv