For some, drooling over the rows of bar cookies, chocolate-covered Oreos, mile-high cakes, pudding parfaits and generously frosted cupcakes at the 4 Rivers dessert enclave is enough. For others, all that excess sugar is just the beginning. It’s yours for the asking – if you want extra frosting on that already-weighted cupcake, no problem. A little more whipped cream on that cakey milkshake? Done. There’s no request your sweet tooth might make that will give the Sweet Shop pause.