COOK THE PASTA: Bring 4 quarts of well-salted and peppered water to boil in an 8-quart pot. Add pasta and cook about 10 minutes or until al dente. Drain and rinse. Tip into a large mixing bowl, drizzle with a tablespoon each of olive oil and red wine vinegar (or to taste) and sprinkle with a good pinch each of salt and pepper. Set aside.
ADD THE ONION, PEPPER, CUCUMBER, TOMATOES, SUN-DRIED TOMATOES, OLIVES, SPICES, AND HERBS TO THE PASTA. Mix well. Taste and adjust seasonings.
GENTLY STIR IN THE COOKED SALMON AND FETA; DRIZZLE GENEROUSLY WITH LEMON-GARLIC VINAIGRETTE. Taste a few different things in the salad and adjust seasonings one last time, including perhaps an extra drizzle of vinaigrette or the red wine vinegar or a last squeeze of lemon. Garnish with pepperoncini, if using. (The salmon and feta crumble easily, so I've left them until last.)
SERVE AT ROOM TEMPERATURE if possible. While the dish is best served fresh, you can prepare the ingredients ahead and put them together the next day if need be. If you take it elsewhere totally prepared, bring along some extra vinaigrette as well as kosher salt and fresh ground pepper to freshen it up just before serving. Keeps 2-3 days well-covered in the refrigerator. Do not freeze.