We did think about allowing some parameters to be changed and there is no technical barrier to implement this. On the other hand, we also want to be cautious exposing these parameters to average users, who may not want to see these options. Anyways, for the sake of getting started, are there any other parameters of the Zimmerman method that you’d like to be able to adjust?
We are also working towards adding the California watering restriction, and working out ET based weather algorithm (which hopefully will become the default algorithm to use once it’s done).