San Francisco would become the first city in the nation to charge drivers just for driving in its chronically congested downtown under a sure-to-be controversial proposal being aired today. Supervisor Jake McGoldrick, chair of the San Francisco Transportation Authority, will ask the agency to study a downtown toll zone -- whereby drivers would need to purchase a daily pass to drive in The City's most congested streets -- as a potential solution to the Municipal Transportation Agency's woeful budget problems. "The key issue here is if we can kill three birds with one stone -- relieve congestion, clean up the...