MItchelskater if you edit the .cs file you can put or remove gears in this specific array (use notepad++ to open de .cs file or any C# editor):
private float[] newRatio = new float[]
{
// feel free to add more gears here :)
-4.093f, // reverse
0f, // neutral
3.424f, // 1st
2.141f, // 2nd... etc
1.318f,
0.98f,
0.81f,
0.68f
};