I’m a frequent user of right clicking my mouse, as the context sensitive options are really handy. After selecting a note, any chance the Write → Edit Duration options could be added to the menu? There appears to be room.
The right-click menu is really the Edit menu, rather than the Write menu. Obviously in practice we can put whatever we like in there, but I’m not convinced about this. Have you considered assigning shortcuts to those commands, if you use them a lot? That would be even quicker than having them in the context menu.