As a quick reply, the OpenSprinkler offers three buttons on the side which have a lot of capability regarding control of the device.
One example, you can cycle programs saved on the device using B3 and one included program is the “test” program which cycles all stations for one minute. You can also make preset programs with specific stations and times for the gardener to run. These programs can have specific names which are displayed on the screen. You can stop all stations from the controller as well.
I hope this gives you an idea of some of the possibilities regarding OpenSprinkler physical interaction.