It's been mentioned in the
Comprehensive List of Suggestions thread at least once.
I agree that it would be a good change to see.
Many StoryCrafters and players prefer to use acts for OOC discussion, contact info, away messages, etc. In addition to being more difficult to delete, easier to edit and a workaround for some site quirks, you're then notified when there are updates in the OOC messages and the like. I'm sure you can imagine how that might be handy upon occasion -- I suggest it to my StoryCrafters who have not already implemented it.