In-game notes

Apologies if this has been discussed before, but I think the ability to take in-game notes about your opponent's movements (or anything else, for that matter) might be useful. The time machine does make it easy to rewind and see what happened, but I like having a document to refer to.
I have found that the communication panel allows players to send messages with no recipients, which does essentially allow one to take notes that nobody can see. Is that intentional?
I have found that the communication panel allows players to send messages with no recipients, which does essentially allow one to take notes that nobody can see. Is that intentional?