In a deep skillet, melt the butter in the remaining 6 tablespoons of oil. Add the garlic, fennel, scallions, peas and broccolini and cook over moderate heat until the fennel is crisp-tender, about 6 minutes. Add the pasta, lemon juice and cooking water and season with salt and pepper. Cook over moderate heat until the water is nearly absorbed. Stir in the remaining herbs. Sprinkle the pasta with the bread crumbs just before serving.