Brush pizza crust (both sides) with 2 Tablespoons of the olive oil and set on baking sheet. Set under broiler and watch carefully until, first one side, then the 2nd, browns a bit. Remove from oven and set aside, but keep broiler on.
In a medium size frying pan, melt butter on med-high heat. Place sage leaves in one layer into pan and watch carefully as they begin to crisp up. Turn them over to get both sides crisp and evenly cooked. Gently remove sage leaves from pan onto a paper towel and sprinkle with a little salt.
Into same pan, add 1 Tbsp. of olive oil and cherry tomatoes. Cook, stirring occasionally, until tomatoes are soft. Add sliced scallions and cook about 1 more minute, stirring frequently.
ASSEMBLE PIZZA: Spread tomato/scallion mixture evenly onto pizza crust. Lightly crush sage leaves and sprinkle them all over. Sprinkle parmesan cheese and desired amount of red pepper flakes. Place under broiler until cheese is melted and pizza is hot.