This one is a really tricky issue. What I did in the original MobileSheets really presents some problems from a technical standpoint. If I start allowing annotations to be drawn outside the page, those annotations could then wind up being drawn on top of other pages depending upon the display mode used (two pages and vertical scrolling in particular). It also causes serious problems once I start allowing annotations to be written out to PDF and image files, as those annotations would be outside of the page and wouldn't be properly saved. Most other viewers would not allow annotations to be created outside pages for this reason. I'm not sure what the right answer is to handling this problem...
Mike
Mike