I use templates (normally graph paper or ruled pages) when I am writing & drawing — but don't want them when I am reading. I would dearly love to have a button so that with a single gesture I can toggle my page background between the currently-chosen template and "blank".

I can imagine two ways to do this. Either have the button control a journal-wide setting (so I can go into "reading mode" and get rid of all templates temporarily), or have the setting be preserved (so that after I complete a page I can hide the template with a single gesture). If the latter, I would also want a preference so that swiping to create a new page automatically hides the template of the current page.