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Joined: Aug 2011
The "narrow space" digits separators look odd to me in all of their occurrences (in a fraction and right or left of the radix) but each for different reasons. The ISO recommendations behind this approach are intended to avoid confusion when numerical information is exchanged and local customs (comma versus dot) for digit separators may lead to confusion. The ISO narrow space approach, while unambiguous, is unfortunately not as visually clear (to me) as either a comma or a dot.
I believe that some users would appreciate their calculator allowing commas, dots, or narrow spaces for digit separators following their local customs and personal preference. Surely any ambiguity or risk of confusion is minimal on a handheld device. Ultimately, though, it's the developer's prerogative to include such niceties or not.
-Bill