OpenDocument format can be used to export both diagrams and comments.
Output requires igo LaTeX package (http://www.ctan.org/tex-archive/fonts/igo/).
Native and compressed fonts
Selection is not relevant for igo -based diagrams.
LaTeX output can contain diagrams using EPS or LaTeX igo package.
Igo package has restrictions on output it can produce. Igo package does not support letter-on-move, so GOWrite does not produce letters on move. This affects exception indication (B123 at A), so output should be checked against those.