IF BALTIMORE County Executive James T. Smith Jr. has his way, the region's largest jurisdiction will soon join a small but growing revolt against the straitjacket strictures of traditional zoning. Up to seven communities will be allowed to write their own codes. The goal: cutting red tape and speeding up revitalization of decaying commercial strips. The County Council should support this radical experiment when enabling legislation is introduced in the next few weeks. From Randallstown to the U.S. 40 corridor, the current zoning approach has failed to spur viable redevelopment; it's time to try alternatives.