Fill a large stockpot with water and bring to a boil over HIGH heat. Salt the water with about a tablespoon of salt. Add pasta and cook until just about 30 seconds past al dente.Drain pasta and toss with a light drizzle of olive oil. Set aside to cool slightly.While pasta is cooling, chop tomatoes, cucumber, and red onion. Set aside in a bowl and add capers to the bowl.Add dressing ingredients, except for olive oil, to a bowl and whisk to combine. While whisking, slowly pour in the olive oil, and continue whisking until completely combined. Taste and adjust salt and pepper accordingly.Add the chopped vegetables and crumbled feta cheese to the pasta bowl. Pour dressing over the top and toss to combine.Cover bowl with plastic wrap and refrigerate for several hours, up to 1 day.Serve cold or at room temperature, and enjoy!