MLS wants to build on the momentum of the World Cup. America’s top domestic cup competition is an obvious place to start The new commissioner of Major League Soccer, Larry Berg, isn’t keen on the idea of promotion and relegation, but he is a fan of jeopardy. When asked the obligatory pro/rel question in his introductory press conference , Berg responded, “I don’t think it’s appropriate for our league, but I think there are other ways to create jeopardy during the regular season, [and] again in…