In a medium bowl, stir the pimento-stuffed olives with the giardiniera, capers and their respective liquids. Add the Calamata olives, garlic, shallot, oregano, parsley, thyme and crushed red pepper. Stir in the olive oil and let the mixture stand for 1 hour.
Open the Italian bread on a work surface. Spoon the olive salad on both sides of the bread and spread evenly. Arrange the mozzarella slices on the bottom half of the bread, then top with the capocollo, Genoa salami and mortadella. Arrange the provolone cheese on the top half of the bread, covering the olive salad completely. Carefully close the sandwich. Wrap the sandwich tightly in plastic and let stand for 30 minutes or up to 2 hours. Cut the sandwich into 8 pieces and serve peperoncini on the side.