Take a look at the Toro TMC-212 Controller.
http://www.toro.com/irrigation/res/smturfcont/tmc212/index.html
This controller has a special functions option that allows for Pump Start and Master Valve settings. You might benefit from this timer because you can run multipule programs at one time (A,B, and C). Program A will have the Master Valve on, Program B you will turn it off. You would have Program A run from say 10AM to 10:15AM (both Master Valve and Zone One will Turn on) Then have Program B run from 10:15AM to 10:30 AM (Only Zone One will Turn on) Hope this helps.
Mark Cardarelli
Ocean State Lawn Sprinkler, Inc.