Using Math quite a lot I noticed a missing feature which is quite important for
a good formatted formula.

number and unit formatting in OOo is a pain. you can use "´" or "~" only. but
they won't do to have a proper formatting.

I am seeking the developers of this part to give option to format numbers with
optional succeeding units according to ISO 31.

Reference can be found here:
http://de.wikipedia.org/wiki/Schreibweise_von_Zahlen#Internationale_Standards

Basically it says that 10³ blocks and units with numbers have to be separated
with a  

I am thinking of an additional command as tsp or even format {put number in
here} which formats the number according ISO 31

ex: format {10000km} => 10 000 km ; 10 000 km
or just the plain number without units