[Kobo Glo, my current FW=2.1.5]
What I would really appreciate is an option to either make the bottom bar disappear while reading, or make it much much smaller, in order to gain screen real estate for a true full-screen reading experience. It looks like this bar is now eating up almost 10% of the vertical screen space, just for showing some page numbers.
I used to own a Kindle (3G - that's before I sat on it), which had a much more modest reading progress bar at the bottom. This is actually my main gripe with the Kobo Glo I just got, which is otherwise great.