Cook the pasta according to package directions. Drain, rinse with cold water, and let cool.
Meanwhile, in a large bowl, whisk together the oil, vinegar, lemon juice, salt, pepper, and dried oregano. Add the tomato and red onion, and let sit for 10 minutes. Add the cooled pasta, cucumber, olives, capers, if using, and herbs. Mix well to combine and dress the pasta.
Top with crumbled feta cheese.
