What you are after is queuing a NODE REQUEST to the end node, but in an automatic manner, at a given time (once per day, after midnight).
I see this being done with an event tied to that particular node. The event would then run at the given time, and queue a REQUEST on your behalf. So this is not an enhancement but rather some custom coding using existing functionality.
You'd need to run the
PiGateway sketch that supports the REQUEST queuing, and follow the protocol to queue that request. I can say this is an advanced feature and will require some coding in the form of that event which you'd then enable on the node. In addition, the node would have to listen to ACKs and parse any ACK for the special "RESET-MY-RAIN-LEVEL" message/token (which is the mechanism used by the PiGateway to send these NODE REQUESTS.
Sorry I don't have specific code examples to share here.