ok, in member_editprofile.html there is that option for the email. maybe if u include the code in register_form.html it will work just try this:
In register_form.html
Find:
<tr>
<td class="row2"><b>{lang_email}</b></td>
<td class="row2"><input type="text" name="user_email" size="30" class="input" value="{user_email}" /></td>
</tr>
Replace:
<tr>
<td class="row1"><b>{lang_email}</b></td>
<td class="row1"><input type="text" name="user_email" size="30" value="{user_email}" class="input" /></td>
</tr>
<tr>
<td class="row2"><b>{lang_email_confirm}</b></td>
<td class="row2"><input type="text" name="user_email2" size="30" value="{user_email2}" class="input" /></td>
</tr>
I hope it work