Papers often have huge margins, but we don't place our notes in these margins but in the side box instead. It would be nice to crop the view to cut out the wasted space, thus making it a bit easier for old eyes to read the text also. Setting different crops for even & odd pages would be a nice extra that is useful for things like scanned magazine articles or older books and the like. I know I can zoom in, but doing it too much gets fiddly and distracting vs just being able to fire and forget crops.