Ah, I found one thing that's kind of bugging me - the text tool.
It seems the text is not layer-specific. It would be nice if it was so I could have a "notes" layer that I can turn on and off for exporting two different images - one for players and one for the DM.
The text tool also seems to create text well above where I actually clicked. Ideally I would imagine the point that I click to be the top-left-most corner of the text box.