1. In a large mixing bowl, combine flour, sugar, salt, and yeast for the rolls. Add warm water and vegetable oil. Mix until a dough forms.
2. Knead the dough on a floured surface for about 10 minutes, until smooth and elastic. Place in a greased bowl, cover, and let rise until doubled in size, about 1 hour.
3. Preheat oven to 375°F (190°C). Punch down the dough and divide into 8 equal pieces. Shape each piece into a roll and place on a baking sheet.
4. For the topping, combine rice flour, sugar, yeast, salt, and warm water. Mix until smooth. Spread the topping over each roll.
5. Bake for 20-25 minutes, until the rolls are golden brown and the topping is cracked and crunchy. Let cool on a wire rack.