The only control feature on the main unit is the self-test, which turns on each station for a specified amount of time one by one. This is activated by pressing pushbutton B1 while starting the controller.
I am curious what kind of controls you want your landscaper to have. If you want the landscaper to be able to set a complete set of programs on the unit, you probably should look at other options. The OpenSprinkler is designed for web-based programming, and its 3-button interface is not suitable for setting programs manually on the unit itself.