Fill a large pot, half way, with water. Bring to a boil, over medim-high heat, and cook elbow macaroni till al dente about 10 minutes. Rinse and drain.
Rinse and drain shrimp and lump-crab. Set aside.
In a small skillet, over high heat, melt 1/2 Tablespoon butter. Add drained corn. Do not stir. As corn roasts/browns it will begin to pop. Gently stir corn until half the kernels are golden brown. Remove from heat and allow to cool.
To make the dressing, in a small bowl combine mayonnaise, sour cream, chopped cilantro, cumin, capers, oregano, Chipotle chili powder, dried dill weed, finely chopped jalapeno pepper, and juice of two limes. Mix well.
In a large bowl add cooked macaroni, shrimp, crab, chopped onions, peppers, and additional cilantro. Add roasted corn and mix well. Add 1/4 cup crumbled Cotija cheese. Add dressing mixture and stir gently until everything is well combined.
Chill Salad for 3 hours before serving.