With dingo, its not clear if I the e-reader is in annotation mode or not.
Pre-dingo it would be clear because the annotation toolbar would be shown as a second row.
With dingo, I have to use the tool menu, which is slow, and check if "annotation" is checked on.

Besides, now that I think about this:
Why have the slow, menu on the e-ink side when it makes far more sense to have it on the fast lcd side?
That would make it just the way I work with photoshop; the picture on the left monitor en editing tools on the right monitor.
Makes even more sense if you keep in mind that placing the editing/annotation menus on the lcd screen, away from the e-reader, would make them far more responsive.