HJ Simpson wrote:

> Does anyone have an pinion on what to do with unused ports?

  It's a FAQ.  Make them outputs.  Set them low.  On the PCB, track them
to a little pad and hole to attach things to later if desired.

> And.... speaking of inputs, what do think is best, pull up and input
> as a clear, or pull down and input as a set?

  It is generally most convenient for switches to return to ground and
use pull-ups.  Port B has internal pull-ups available for this purpose.
--
  Cheers,
        Paul B.