"Running Logistic Regression (Weka) for the Yes Class"

When I run a logistic regression (weka) sometime I get the "wrong" equation. Instead of running the regression for the positive class ("yes"), RM or Weka run it for the negative class. Is there a way of forcing RM or Weka to use the "yes" class. See example below.

I know that it doesn't make any difference for predictions. I know that the fix is very easy ("to get the coefficients for the "yes" class, just reverse the sign") but... this had been driving me crazy since I started using RM (a few years ago).

Thanks in advance for any help.

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<process version="6.5.002">
  <context>
    <input/>
    <output/>
    <macros/>
  </context>
  <operator activated="true" class="process" compatibility="6.5.002" expanded="true" name="Process">
    <process expanded="true">
      <operator activated="true" class="read_url" compatibility="6.5.002" expanded="true" height="60" name="Read URL" width="90" x="112" y="120">
        <parameter key="url" value="https://s3.amazonaws.com/mirlitus/subscription.csv"/>
        <parameter key="read_attribute_names" value="true"/>
      </operator>
      <operator activated="true" class="set_role" compatibility="6.5.002" expanded="true" height="76" name="Set Role" width="90" x="313" y="120">
        <parameter key="attribute_name" value="id"/>
        <parameter key="target_role" value="id"/>
        <list key="set_additional_roles">
          <parameter key="subscribe" value="label"/>
        </list>
      </operator>
      <operator activated="true" class="weka:W-Logistic" compatibility="5.3.001" expanded="true" height="76" name="W-Logistic" width="90" x="514" y="120"/>
      <connect from_op="Read URL" from_port="output" to_op="Set Role" to_port="example set input"/>
      <connect from_op="Set Role" from_port="example set output" to_op="W-Logistic" to_port="training set"/>
      <connect from_op="W-Logistic" from_port="model" to_port="result 1"/>
      <portSpacing port="source_input 1" spacing="0"/>
      <portSpacing port="sink_result 1" spacing="0"/>
      <portSpacing port="sink_result 2" spacing="0"/>
    </process>
  </operator>
</process>