We use the custom rules for holidays and all sorts of scheduled and unscheduled closures in our queues and IVRs. As an example our offices closed yesterday at 2pm due to heavy lake-effect snow. Adjusting my "Weather Closure" rules is easy and it works great (even if the staff queue managers never do it themselves).
However, what we don't have is an easy way to inform callers about the reason for the closure. The queue is simply closed, callers get sent to voicemail, and that's it.
I could re-record the Call Queue Greeting, but that's not a good solution for unanticipated closures when we plan to be open the next day. Departments often record custom greetings and I can't just delete those, and expect the staff to re-record every time. Not gonna happen.
These unanticipated closures are random times and lengths when they happen. Yesterday was 2pm for the rest of the business day. A couple weeks ago we were closed until 10am, then consider staff meetings, lunch periods, and so on. We use the rules a lot.
What would be awesome is a special text-to-speech greeting option within the custom rule which only plays when the rule is triggered, and overrides the regular Call Queue Greeting.
Recording a custom rule greeting is OK too, but TTS is important because I often need to close our phones when working remotely where using a microphone isn't appropriate or won't sound professional.