Currently, notes on a drawing carry a second-class position in relation to dimensions with regard to how they are positioned and how other things are positioned in relation to them. A simple example is can be found in attempting to annotate an external threaded surface. A normal dimension always remains radial to the surface, and datums and tolerances can be attached to it. In contrast, a note must be manually positioned to be radial to the surface, and datums and tolerances can be placed near the note, but will not move with it (and cannot be made to do so) if the note gets moved. The ultimate point is that notes are often used to do things dimensions can't because they are more customizable as far as what can go in them, but using them has the consequences of making it significantly more difficult to position them correctly. Those consequences seem unnecessary to me.
As far as I know, these things are not possible to do currently (hence the reason for not marking this as a question). If someone knows of a way to do this that I'm not aware of, I would be very interested in knowing what it is.
Here are a couple images illustrating what I'm talking about: