I don't see how this is much different functionally than the chat box and note to self options that are already available. This suggestion appears to want a new "Game Notes" box or something in addition to the Game Chat. I doubt CC will want to clutter up the screen with redundant features. Moving this to REJECTED
There are a couple aspects related to this suggestion that have some merit.
For example, having the option to move the chat box to the top of the screen would be nice, IMO. You can currently use the BOB plug-in for that until the site allows this feature (if ever): viewtopic.php?f=527&t=161049
Having the option to toggle on and off the chatter of opponent(s) would probably also be nice (though I'm not sure how often it would get used). The chatglove plug-in does allow this when the chat is detached (but for some reason not when the chat is attached): viewtopic.php?f=527&t=132761
Both of these plug-ins do much more than that, but those features are directly related to this suggestion.