Hi Jack,
MobiLinc for Android and EZFlora control can only control the valves and not the built-in timer function. Simplehomenet has a small utility you can download to setup the valve on times but that's about it. Using the SmartLinc's built-in web interface you could setup On times for a scene to kick the valve on at a fixed time every day.
My recommendation is if you are interested in creating custom timers and want finer control over the EZFlora is to replace your SmartLinc with the ISY-99i. The ISY-99i will give you the fine control to setup custom programs to accommodate any watering schedule you can think of. Multiple times during the day or only run on certain days, etc. There are a number of other benefits to using the ISY-99i over the SmartLinc as well including drag and drop scene and device addition/modification to your setup, real-time device and scene status, and custom program/macro capability.
We sell both the ISY-99i and the EZFlora device through our online store:
http://mobilincstore.com. Right now through the holidays we are running some really great deals on the ISY-99i kits.
Please let me know if I can help answer any other questions.
Wes