Watering “Dial” on Flex Daily

I have some zones that, despite my best efforts to set everything correctly, including advanced settings, simply water too much or too little. The solution I’ve found described on the rach.io site is to adjust the inches per hour setting for the nozzle type. How about an advanced setting that defaults to 100% and simply allows the user to water, say, 120% of the Flex Daily amount or 80%. This would be very helpful, as opposed to “faking out” the inches per hour setting.