WASHINGTON, Aug. 11 — Defense Secretary Donald H. Rumsfeld is considering ways to expand broadly the role of American Special Operations Forces in the global campaign against terrorism, including sending them worldwide to capture or kill Al Qaeda leaders far from the battlefields of Afghanistan, according to Pentagon and intelligence officials. Proposals now being discussed by Mr. Rumsfeld and senior military officers could ultimately lead Special Operations units to get more deeply involved in long-term covert operations in countries where the United States is not at open war and, in some cases, where the local government is not informed of...