In a large bowl, whisk oil, red wine vinegar, lemon juice, Dijon mustard, honey, garlic, oregano, 1 ½ teaspoons kosher salt, and pepper until combined; set aside.
In a large pot of salted boiling water, cook pasta until fully tender, about 2 minutes past the al dente stage. Drain pasta and transfer to a rimmed baking sheet, then quickly toss with ½ cup of prepared dressing. Let cool completely on sheet pan, about 15 minutes.
Add tomatoes, cucumbers, olives, pepperoncini, pickled onions, feta, dill, and cooled pasta to the large bowl with remaining dressing and toss until evenly coated. Season to taste with salt and pepper. Cover and refrigerate until flavors meld, about 30 minutes.
Transfer pasta salad to a serving bowl. Top with additional dill. Serve.
