It is on our to-do list to consider in a future update. I don't know if this is a possibility or not for you, but the Safari web browser allows you to resize text fields by dragging them to any size that you want.
Would it be possible to alter the behaviour of the notes text box to make it compatible with inline browser text editors such as Xinha? I was using Xinha in the classic view where it works fine but after being prompted to change the default view away from Classic, it now doesn't as the text box closes as soon as I click away from it. Manually adding markup is a tad slow!