Your file is a little modified, would it just be easier to add this in on your own?
Open usercheckout.php(mod version):
find:
PHP Code:
//Mod
if($numrows < 1 && $couponcode<>"")
{
and add this just inside that brace:
PHP Code:
$opt1 = $_POST['opt1'];
$class_tpl->assign('opt1',$opt1);
$class_tpl->assign('returnExtra', true);
Then open step3.tpl.php
and find:
HTML Code:
{$extra_listing_fields}
replace that line with this one:
HTML Code:
{if $returnExtra}
<tr>
<td align='left' class="formleft"> Shipping Availability:</td>
<td align='left' class="formright"><select name="opt1">
<option value="Pickup Only" {if $opt1=="Pickup Only"} SELECTED{/if}>Pickup Only</option>
<option value="Shipping is Available" {if $opt1=="Shipping is Available"} SELECTED{/if}>Shipping is Available</option>
</select></td>
</tr>
{else}
{$extra_listing_fields}
{/if}
Let me know if this works out. I can include it in a zip if you'd like.