- when I change zoom mid-document, scroll to the same position in the text I was before

- modify default zoom level depending on the browser window size (I had to zoom twice before the size was reasonable)

- put the document-action keys on the top (the bottom is for statuses). It took me long enough to realize the bottom pane was where things were that I would have left if this were a paper I came across on HN/prog.reddit

- don't force registration to download, that's just rude