It would be very useful if rooms had an option (radio
button or checkbox) to restrict booking to only the
room or area admins. When enabled this would cause
booking requests from who are not room or area admins
to send an email to the room admins.
This option could be used for high value rooms such as
conference centers, operating rooms, control rooms, etc.
This is similar to feature request 1230334 but
relatively easy to implement.