What I need is:

If the coupon type is 'F' (flat amount)
AND there is more than 1 product in the cart
AND the customer is in a discount group
THEN the coupon = the full coupon amount up to 100% of the subtotal price

I think I would need to change this code... But not sure how.

Code:
} elseif ($coupon->fields['coupon_type'] == 'F') {
            $od_amount['total'] = round($coupon->fields['coupon_amount'] * ($orderTotal>0), 3);
            $od_amount['type'] = 'F';
            $ratio = $od_amount['total']/$orderTotal;
          }