about writing primary units: fraction

Hi.
I am using Autocad 2007. I have two problem.

1. I am using fraction ( horizontal format) as primary unit in
dimension style. But it writes all of fractions as whole number and
simple fraction, for example it writes 3 1/2 but I want it to write as
compound fraction i.e. 7/6 instead of 3 1/2. Can I do set as default
in dimensional style? and if ok, How?

2. When it write fractions as mentioned above, whole part of fraction
is much bigger (in terms of font size) than fraction's numbers. for
example, it measure distance as 2 3/4 but 2 is bigger than 3 and 4
with respect to font size. Can I adjust it such that all of the
numbers have same font size?

Thanks in advance