Cut peppers in half lengthwise; remove stems and seeds. Set aside. In a large bowl, combine the tomato, cheeses, basil and oregano. Crumble sausage over mixture and mix well. Spoon into pepper halves.
Prepare grill for indirect heat, using a drip pan. Place peppers over drip pan. Grill, covered, over indirect medium heat for 30-35 minutes or until sausage is no longer pink and peppers are tender. Sprinkle with additional cheese.