You know how you have grease pencil and you can see that for reference in the 3D viewport, well why not have something like that where you can expand little text boxes at parts of your mesh (boxes which can be completely hidden too with a check box so as not to get in the way) as reminders of things. Take for example if you want to have a mouth where the teeth on one side are angled differently (for say, a goofy character) and you want to remind yourself of this after you’ve finished using the mirror tool then maybe a note there would be a good reminder?
It was just a thought. :spin: