No worries man, just remember to let the meat shine. You may have smoked it for 12 hours, and now you're gonna ruin all that hard work? You may have seen restaurants mix it with sauce, but what they are doing is covering something. It's probably reheated or overcooked and this adds the moisture they need to zap it back. I've seen places simmer it in a pan straight from the cooler. Sauce, if any, on pulled pork, is a dab on the top, pickles for an acidic bite. Slaw is definitely allowed. A good bark will add lots of flavor also. When you bite down you get all those flavors, but the meat is naked and you can taste it.
You can add whatever you like too. Cabbage, apples, whatever tickles your fancy. The trick is layers.