For reference this topic was about implementing a dialog system.
You might want to have a look at it for some ideas about implementing lots of textual narrative.
As usual with features request, Ashley has a lot to do already, this might get implemented, but no timetable for it.
This bugs me a little though as the editbox is multiline in the sense that if you press shift+enter it will jump a line and allow you to continue entering your text.
This works the same for the comments.
Does this do the trick ?