Customize/tweaking resources often requires to set specific spec parameter or adding annotations to the resources. Examples:

• attaching interfaces via net-attach-defs to a resource

annotations: 
    k8s.v1.cni.cncf.io/networks: '[{"name": "internalapi", "namespace": "openstack"}]'

• tweak timeout value for a route
  https://docs.openshift.com/container-platform/4.10/networking/routes/route-configuration.html#nw-configuring-route-timeouts_route-configuration

• customize service spec for a specific LoadBalancer (metallb)
• Tweaking resources limits/requests for service pods
• Tweaking health, liveness, startup Probes for service pods

To make this generic and prevent adding new parameters when there is a new use case to the service operators, there should be a generic service and deploy resource override per operator so that specific tunings could be merged/overridden the default.