Rain Delay Despite Just a Sprinkle

The last couple of weeks we had several days with very light rain. It basically just wets the surface but evaporates quickly. It didn’t do anything to water the grass and plants. Yet, OpenSprinkler keeps on delaying watering and my grass and plants are dying. The concept is great because I don’t want to have my sprinkler coming on when we just had a downpour in November. Is there a way to ‘fine tune’ this rain delay? For instance:

* Is there a better weather source than AutoRainDelay?
* Can I somewhere adjust the rain delay threshold, i.e. if the source of AutoRainDelay reports 3mm of rain the rain delay doesn’t kick in but if it’s more than 3mm then it will kick in?
* Even better, if the amount is <=3mm then there is no rain delay. If it is >=6mm the there is a full rain delay. In between it will adjust the time how long each zone is opened.
* An option to have rain delay only enabled between November and March. All other months the rain delay is ignored.