Yes, there's a button - but where that button is depends on how exactly you installed it. Mine's on the main toolbar. Select the books you want the reading status data for, then click on the menu arrow from the "Kobo" logo, and then the option "Store/Restore Current Bookmark". It's not going to automagically get bookmarks for everything — it can't really tell which books you may have been reading since the last update (or can it, David? What if you save the last sync time, and then get everything with a read date later than that?).
I'd rather like to be able to get the annotations for all books that have them, too, but it's the same situation as the bookmarks (not surprisingly, since bookmarks are considered a type of annotation). And you probably wouldn't want to get the annotations for all books more than once.
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