Have you tried using this in an action:

Code:

---

define x_scale, skill1;
define y_scale, skill2;
define z_scale, skill3;

//uses:  x_scale, y_scale, z_scale
action scale_me
{
	my.scale_x = my.skill1;
	my.scale_y = my.skill2;
	my.scale_z = my.skill3;
	wait(1);
	my.dynamic = off; // speeds up rendering, if unchanging
}

---

This is one way of doing it. Just assign this action to the model and change the first 3 skill values to set the scale factor.