[Libreoffice] Questions about measure units.

Hello there,
I've been taking a look to this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=34899 and i've realized that Km
and Miles can be never used because the maximum value is set to 20 cm and
the number of decimals to 2: DecimalDigits = 2 ; So whatever value I use,I
always get 0.00km or 0.00 miles. This problem can be check in draw, Tools -
Options - Libreoffice Impress - General. It also appens in others.
However, in Writer there're only these measure units: mm, cm, Inch, pica,
point.
So I'm wondering whether all the suites should have the same measure units
and if not, What's the point of having km or miles when they always return
0.00.

Grettings