Well, off the top of my head, I have one idea, but it involves some assumptions. This is just a brain-dump. This would have to be something the user could disable, but if we assume a note-taking scenario, as opposed to sketching, then one idea would be to have an unobtrusive hotspot-button appear above where you are writing, which, if tapped, will act like a carriage return. Obviously, this assumes they are writing in the lines, and could have some usability concerns in terms of retroactive editing of typos, etc, but it illustrates the use-case I'm talking about. If anyone has better ideas, please suggest them.