Hi BurrMan,

I do not now much about javascript but
i did take a look at the gear script and
found these variables:

var PD = N / DP; // Pitch Diameter
var BD = PD * Math.cos( PA ); // Base Circle Diameter
var A = 1.0 / DP; // Addendum
var D = 1.157 / DP; // Dedendum
var OD = PD + 2 * A; // Outside Diameter
var RD = PD - 2 * D; // Root Diameter

Maybe if you play with the values and save it under
a different name you can see what happens