Such an interface sounds like a good idea. However, before building a general interface for this, we’d want to add functionality that addresses particular use cases.
If you have ideas for what such an interface would look, please do add to the discussion!
As a side, it seems that the Kubernetes project is only recently getting around to exposing knobs to control scale down of ReplicaSets. (Side because the Ray operator does not currently use k8s controllers for scaling.)