[GraemeJ]

MS is really just a fancy viewer for pdf files and as such, it will display anything you like in that format (also jpegs).

Performance notes is a good idea, but instead of thinking up a fancy naming system, why not just add the notes as an additional page of the chart it refers to? Then any notes you have made are unalterably linked to their respective chart.

My preference would be to make it the first page, so that notes you had made would display before you start performing the piece.

Also, I believe that Mike is making some changes to the internal 'notes' function in the next version and what you are suggesting may not even be required then.