In the bottom of a large bowl, combine 1 tablespoon of olive oil, the lemon juice, garlic, thyme, ¼ teaspoon salt, and several grinds of black pepper. Add the cooled couscous and toss. Slice the remaining raw cherry tomatoes in half and add them to the bowl with the roasted tomatoes, the chickpeas, basil, cucumbers, and feta. Top with more fresh herbs and a generous drizzle of olive oil. Season to taste.