After testing it some more I got suggestions:

Make the default background dark dark grey or black (to fit Maemo5+ theme). Even on rich text and checklist nodes I personally think. White text and pen tool as default.

I would also like to see a hand tool for scrolling (test Xournal which does that very well). Then we can get rid of those scrollbars.. It is perfekt for Stylus use .. just point and drag.

Here is a mockup of dark grey and black screen for sketch:

I like the black!