[BirdOPrey5]

It could be done now with a template edit.

In the really_fast_reg_bop5_vb4 template change-

       <td width="25%">
         {vb:rawphrase bop5_rfr_agree_to_rules, {vb:raw session.sessionurl}} &nbsp; <input type="checkbox" name="rfrr" id="bop5_rules_agree" tabindex="1" value="1" <vb:if condition="$vboptions['bop5rfr_rulescheck']">checked="checked"</vb:if> onchange="bop5_rfrcheck_submit();" onmouseout="bop5_rfrcheck_submit();" />
        </td>

to

      <input type="hidden" name="rfrr" id="bop5_rules_agree" value="1"  />

I'll look into making it a built in option in the next release.