I am for the above too.
While you are at the code, would it be possible to log when the rain sensor is enabled and disabled? I ask this for two reasons:
1). to see such events actually logged in the log file.
2). I use a Rain Bird WR2 rain sensor and this has its own delays and options such as temperature low limit and depth of rainfall that stop watering based upon these settings. It also has an evaporative system (4 leather washers) that impose their own watering delay. These parameters are only viewable on the WR2’s screen.