It would be great to be able to manually
It would be great to be able to manually pause/resume queues (collect from producers but pause dispatch to consumers) and also to purge queue messages. This help both in development and in production e.g. maintenance/migration, disaster recovery, or when dependent services are experiencing downtime. Queues are good for decoupling services for this very reason, and it's good to be able to intervene in emergencies!
