This has been discussed in a thread under 'Project Documentation', but I wanted to raise it again as a wish with a poll.
The idea is to be able to publish a revised layout along with its revision letter (or number), so that the resulting .DWG or .PDF file doesn't over-write the previous revision.
Also to have a schedule of revisions on the layout, ideally with the latest revision letter in the schedule linked to the revision letter forming part of the drawing number.