Text tool fractions

[DD]

Hi,

With the text tool, if I type 1/2 it changes into a smaller and better representation of a half.

The same seems to be true for other even denominators but not for odd.

e.g 1/3 doesn't change.

Even denominators > 8 e.g. 1/16 don't change.

Do I have any control over this process ?

I haven't found anything in the help but maybe I'm not looking in the right place.

Thanks
Dave D