ONOS provides “useful Northbound abstractions and APIs to enable easier application development”. Such abstractions and APIs are not only easy to use but also powerful as they basically allow ONOS applications to do anything desired, and it is indeed necessary to grant such a powerful authority to applications to offer as much network programmability as possible. Such powerful capabilities of ONOS applications may introduce potential misuse opportunities or software failures, and eventually affect the behavior of the managed network. In the case of the network with certain requirements (e.g., mission-critical networks), the network operators may want to configure the controller environment to be a bit more conservative by restricting the capability of the applications. For those who wish to configure ONOS to behave in a conservative manner, we propose two features that could be applied to ONOS.