First, as many others, I'd like to say that you are doing a great job with this PDF viewer/editor, it makes life and colaborations so much easier.
The callout tool is nice, but I think it could be improved: if the item I want to point to is on the right margin of the page, the callout will look kind of funny, with its pointing arrow going to its LEFT side, then beneath the text box and then crossing most of the width of the page. In the point where the arrow bends from horizontal to whatever angle, you already have a control point which is draggable. Why not to be able to drag it to the OTHER side of the text box and thus allow for a neat layout. It's maybe a bit difficult to understand what I mean, so I think this image is worth some 200 words:

Pushing it even further: why not to be able to move the control point also above/below the callout box? Thanks for your consideration,
Alex
