very useful plugin - thanks a lot!
Though HTML is my preferred format (and firefox my preferred reader) EPUB is rapidly gaining ground; was on the lookout for something like this.
I use it all the time for reading my e-books... the thing is that I prefer to navigate using solely the keyboard, reaching out to click the navigation buttons to move between chapters gets to be a bit of a drag.
If it isn't too much trouble, could you hot-key the navigation buttons? Defaults (or even a permanent assignment) of the left arrow key/page-up for moving to the previous section/chapter and the right arrow key/page-down for moving to the next section/chapter should work well.
I realise that you already have the "use keys to trigger buttons" feature under the scanner for future implementation, so hope this won't be too much trouble!
EDIT: I don't mean "hot-key" in the traditional sense of the word - more like assignment of a key to a button.