Ray, a great product. I also think it makes a lot of sense to have the feature available with one click under the advanced options tab for each program. It could allow the average weather data to be calculated over the same period of time as the interval of the program. And this duration could be unique to each program.
(In terms of balancing flexibility with the number of parameters available to users, I think these two parameters are one and the same thing given that more parameters available to users results in more flexibility.)
Best Regards, Michael.