I'll try to tell you what I know, maybe it helps.
The strenght of the shininess is controlled by the value for shininess in the .shd and the color/transparency of the alpha channel of the specular map.
The shininess gets less with a higher value - there seems to be no real limit.
And the shininess gets less with a alpha channel closer to black - black is not shiny and white very shiny (all the shininess-value allows).
I don't know how both influence each other, but maybe it's a start to use a value of about 10 and do the rest with the specular map.
I found it very good for example to make several planes in 3ds Max with a stone or street texture or something but each with another .shd file connected so you can see the differences. And you can use the Map Viewer to see it immediately.
For changing the textures/alpha channel for example I use GIMP.
About the grass:
I think the distance is as it is. (I never have 3D Grass on so I don't know - maybe it changes with the drawing distance?)
You could try to make the grass fit to the ground texture a bit better and/or make it smaller so it vanishes in the distance and doesn't just stop.
It looks like you used the color map as well. The color map colors the grass texture (with black, yellow, red, blue on your color map you get black, yellow, red, blue grass ...). Maybe delete that first to see wether it looks a bit less eye-catching.
If something is unclear or you need some further explanation just ask.
The strenght of the shininess is controlled by the value for shininess in the .shd and the color/transparency of the alpha channel of the specular map.
The shininess gets less with a higher value - there seems to be no real limit.
And the shininess gets less with a alpha channel closer to black - black is not shiny and white very shiny (all the shininess-value allows).
I don't know how both influence each other, but maybe it's a start to use a value of about 10 and do the rest with the specular map.
I found it very good for example to make several planes in 3ds Max with a stone or street texture or something but each with another .shd file connected so you can see the differences. And you can use the Map Viewer to see it immediately.
For changing the textures/alpha channel for example I use GIMP.
About the grass:
I think the distance is as it is. (I never have 3D Grass on so I don't know - maybe it changes with the drawing distance?)
You could try to make the grass fit to the ground texture a bit better and/or make it smaller so it vanishes in the distance and doesn't just stop.
It looks like you used the color map as well. The color map colors the grass texture (with black, yellow, red, blue on your color map you get black, yellow, red, blue grass ...). Maybe delete that first to see wether it looks a bit less eye-catching.
If something is unclear or you need some further explanation just ask.