Thanks for the feedback!

I am happy to say that most of your requests are "coming back" with one of the next release.
The ability to change the background to whatever you want, the ability to set the size of the page to pre-defined format (A4, A4 Letter and so on up to Custom size).

Some won't. Or at least not in a near future. I will investigate some of them (like exporting to different formats rather then PDF alone) or the "batch" export of notes.

At work now, I will try a more complete answer soon