A full screen option while in the word processor would be lovely. It's one of the few things that makes me regret not using Scrivener. (I am a big Page Four fan.)
A select all option would be nice too. I use that one a lot, but I don't see it here.
I like how you can paste pictures into notes. I can see that coming in handy occasionally.
It would be nice to be able to quickly maximize and minimize the notes window (not full screen, but make it larger without manually pulling the edge of it).
I'd like to be able to not only default the font type, but also default the font color and page background color. It's one of the many things I like about Page Four.