Shader too bright any way to reduce further?

Hey,

so the title is a bit weird, so let me explain what the situation is.
I just created a material and selected Nature/Terrain/Bumped Specular
and then attached it to the Terrain. However I feel like the shininess
is way to bright. This is the lowest I can set on the slider (as seen in
the picture below). Is there anyway I can further reduce this shininess?

Here is the picture where you can see the shininess:

Any help is appreciated, or maybe if someone can reference me a
tutorial on how to make a custom shader (in unity3d free version)
it would be so great.

Thanks a lot.
Kind Regards
Cribbel

Here you can download sources of the built-in shaders, Nature/Terrain/Bumped Specular included.

http://unity3d.com/unity/download/archive

You can try to change the allowed range of _Shininess property, which is defined like this:

_Shininess ("Shininess", Range (0.03, 1)

If it won’t be enough, you can try to write a custom shader, one of the most extensive tutorials on shader writing in Unity can be found here:

http://en.wikibooks.org/wiki/Cg_Programming/Unity