I have already asked Russ if this is possible for the ability to add notes to the note book whilst it is still your turn without making a move. Russ agrees to make the changes if others want this feature.
Personally I think this feature would be valuable particularly if you have several options you wish to think about but need to leave the game or the site before making a move.
So this is really a thread to judge the popularity of this idea. Post or recommend if you would like to see it.