Not sure if suggestions are welcome here but for musiconhold if would be cool if there was an ‘interval’ option to go along with ‘announcement=queue-thankyou’. IOW: Play the announcement after X number of files instead of after every file.
This is about the queue application, not music on hold.
If you are making wish list items it is even more important. than usual, that the thread subject properly summarise the proposal. The current one will not help someone work out what you wanted when someone looks through the archives in a year or two’s time.
Generally, though the developer mailing list would be a better place, although to really get anything done, you need to contribute code yourself.