Sprinkler Water Coverage

Iro sets watering times under the assumption that all sprinklers are installed the same. There are wide variations in amount of sprinkler head spray overlap even between different zones in the same yard. This fact alone can have a huge impact on the effectiveness of the watering schedule - arguably more than weather, soil type, or grade.

I would like to be able to add the amount of sprinkler overlap to each zone and have Iro modify watering times accordingly.