Create areas on the fly

When a project is just starting out, often it won't have many items added to the 'Area' section until ad admin starts adding them. It would be great to allow administrators to add an area on the fly when writing a new ticket. Eg. the bottom option in the 'Area' dropdown could say "Add new..." and a modal dialog would allow you to enter the name of a new area which then gets automatically added to the project.