I don't really care what we end up with as default (allthough I will probably eventually switch to Openbox for consistency with my other setups), but I have to say that I find the keyboard shortcuts provided by the Openbox configuration in the PND repo is excellent and I would miss it quite a lot if Pyra were to come without it by default. I'm not sure how well used it would be by the general public, but I think it would be liked. In particular, I had a friend who felt that the xfce default setup was a bit clumsy to use due to major touch screen requirements which I suggested openbox@pndrepo to, he found it a major improvement.
To clarify: Ctrl (right shoulder)+up/down works well as alt-tab (Ctrl+left/right switches between desktops, but I never used multiple desktops myself), Ctrl+5 toggles fullscreen borderless, Ctrl+4 toggles maximize, Ctrl+Q quits the running application, which I remapped to Ctrl+Shift+Q because ctrl+q was interfering with some applications. I would say that these shortcuts improved my productivity with the device around five-fold at least.