The current editing of annotations in Voila seems somewhat awkward to me.
With the current interface, say you create a shape annotation, and then you want to edit the stroke. To accomplish this edit currently, one must click on the Organization tab, select the annotation, click back on the Tools tab, and then make the changes ... all because there is no way (that I can see) to select an existing annotation from within the Tools pane.
The simple solution would be to add a Selection tool in the Tools pane ... so the Voila toolbox would be more like that of a traditional Mac drawing app (remember MacDraw?).
Then, after adding one or more annotations, the user could simply choose the Selection tool, click on an annotation and make desired property edits.