This feature introduces a feature allowing users with the new block/mrbs:doublebook capability to double-book a room.
The Edit Entry page has an option to disable hiding occupied rooms so bookings can be made in a room where one exists already. If a double-book is attempted, clash errors are still displayed, but users with the capability can click an "I don't care" button to double-book the room regardless.
The user who originally booked the room is then notified by e-mail.