It would be an improvement if RM had a syringe option for each zone with a temperature threshold and a syringe time setting. 

For example, in the Northwest our grass is susceptible to heat damage during the few days each year that the temperature exceeds 85.  If there was a syringe option and the temperature exceeded 85, lawn zones could come on for some set time, say 3 minutes, to cool off the grass once each day.

An alternative is to create a syringe program where each zone runs for a set number of minutes and trigger the zone to run once each day when the temperature exceeds the threshold.