I’ve been using the OS with the mod for using RF switches.
I have rf lights that run from 5pm to 9am, the lights ignore the rain delay.
When the rf controlled lights are on the lower green display (line at bottom of display) shows the time remaining all night, but the problem is that this display hides rain delay information if the rain sensor becomes active and/or a manual rain delay is entered.
What i suggest is under the date and time and water level:xx% at the top of the main screen you add a display for the rain sensor status. what it could be is a rain icon with an icon for a sensor if sensor is activated and a hand with the time remaining if a manual entry has been made and this could all be in red.